Firefox Esr

Multiple memory corruption vulnerabilities in Mozilla Firefox (< 149.0.2) and Firefox ESR (< 140.9.1) enable unauthenticated remote code execution with critical CVSS 9.8 severity. These memory safety bugs-including CWE-787 out-of-bounds write issues-affect both standard and Extended Support Release channels, with Mozilla confirming evidence of memory corruption exploitable for arbitrary code execution. No active exploitation confirmed (not in CISA KEV) and no public exploit identified at time of analysis, though CVSS vector indicates network-accessible attack requiring no user interaction.

Integer overflow in Firefox and Firefox ESR text rendering engine allows remote attackers to achieve arbitrary code execution via specially crafted web content. Affects Firefox versions prior to 149.0.2 and Firefox ESR prior to 140.9.1. Attack requires user interaction (visiting malicious webpage) but no authentication. CVSS 8.8 (High severity). No public exploit identified at time of analysis, though the vulnerability class (integer overflow leading to buffer overflow) is well-understood and exploitable.

Remote code execution in Mozilla Firefox and Thunderbird via memory corruption vulnerabilities allows unauthenticated remote attackers to execute arbitrary code without user interaction. Affects Firefox <149.0.2, Firefox ESR <115.34.1, and Firefox ESR <140.9.1 across desktop platforms. With CVSS 9.8 (critical severity, network-accessible, no privileges required) and CWE-119 buffer overflow classification, this represents multiple memory safety bugs that Mozilla assessed could be exploited for arbitrary code execution. No public exploit identified at time of analysis; EPSS data not provided but critical browser vulnerabilities historically attract rapid exploitation interest.

Multiple memory safety bugs affecting Firefox, Firefox ESR, and Thunderbird browsers present a critical remote code execution risk through memory corruption vulnerabilities. The affected versions include Firefox below 149, Firefox ESR below 115.34 and 140.9, Thunderbird ESR 140.8, Firefox 148, and Thunderbird 148. These memory safety issues demonstrate evidence of exploitable memory corruption that could allow attackers to execute arbitrary code on affected systems, though no public exploit or active KEV confirmation is currently documented.

Multiple memory safety bugs affecting Firefox, Firefox ESR, Thunderbird, and Thunderbird ESR allow remote attackers to achieve arbitrary code execution through memory corruption vulnerabilities. Firefox versions prior to 149 and Firefox ESR versions prior to 140.9 are confirmed affected, with evidence suggesting these memory corruption issues could be exploited under sufficient effort. The vulnerability class encompasses buffer overflow and memory safety defects that demonstrate exploitation potential, though no active public exploitation has been documented at this time.

This vulnerability is a mitigation bypass in Firefox's HTTP networking component that allows attackers to circumvent existing security controls. Firefox versions below 149 and Firefox ESR versions below 140.9 are affected, enabling attackers to bypass authentication or other HTTP-level protections. While specific CVSS and EPSS scores are not provided, the mitigation bypass classification and Mozilla's issuance of security advisories indicate this requires prompt patching.

A boundary condition vulnerability exists in Firefox's Layout: Text and Fonts component that can lead to information disclosure. This affects Firefox versions below 149, Firefox ESR versions below 115.34, and Firefox ESR versions below 140.9. An attacker could exploit incorrect boundary handling in text and font rendering to potentially disclose sensitive information from memory, though specific exploitation details and active exploitation status are not publicly documented in the available intelligence.

A JIT miscompilation vulnerability exists in Firefox's JavaScript engine that can lead to information disclosure. This affects Firefox versions below 149, Firefox ESR below 115.34, and Firefox ESR below 140.9. An attacker can exploit this flaw through malicious JavaScript to extract sensitive information from the browser's memory, potentially compromising user data and system security.

A boundary condition vulnerability exists in Firefox and Firefox ESR's Audio/Video Web Codecs component that allows information disclosure. The vulnerability affects Firefox versions prior to 149 and Firefox ESR versions prior to 140.9. An attacker can exploit this flaw to disclose sensitive information, potentially leveraging web-based attack vectors without requiring elevated privileges.

Unauthenticated remote attackers can achieve arbitrary code execution through a use-after-free memory corruption vulnerability in Firefox's text and font rendering engine, affecting Firefox versions below 149, ESR below 115.34, and ESR below 140.9. The vulnerability requires no user interaction or special privileges and allows complete compromise of confidentiality, integrity, and availability. No patch is currently available.

A boundary condition vulnerability exists in Firefox's Audio/Video Web Codecs component that allows information disclosure to attackers. Firefox versions prior to 149 and Firefox ESR versions prior to 140.9 are affected. An attacker can exploit incorrect boundary condition handling in codec processing to read sensitive memory contents or application state.

A boundary condition vulnerability combined with an integer overflow flaw exists in the Graphics component of Mozilla Firefox, affecting Firefox versions prior to 149, Firefox ESR versions prior to 115.34, and Firefox ESR versions prior to 140.9. This vulnerability could allow an attacker to trigger a buffer overflow through specially crafted graphics data, potentially leading to memory corruption and arbitrary code execution. While no CVSS score or EPSS data is currently available, the Mozilla security advisories confirm the vulnerability affects multiple product lines across different release channels.

An incorrect boundary condition vulnerability exists in the Audio/Video playback component of Mozilla Firefox, affecting Firefox versions below 149, Firefox ESR below 115.34, and Firefox ESR below 140.9. This flaw enables information disclosure through improper memory boundary handling during media playback operations. While specific exploit details and CVSS metrics are not publicly disclosed, the vulnerability is categorized as an information disclosure issue affecting all three Firefox release channels.

A sandbox escape vulnerability exists in Firefox's Responsive Design Mode component that allows attackers to break out of the browser's security sandbox and access sensitive information. This affects Firefox versions prior to 149, Firefox ESR prior to 115.34, and Firefox ESR prior to 140.9. An attacker can exploit this vulnerability to disclose information by circumventing the sandbox restrictions that normally isolate web content from the browser's privileged context.

Critical use-after-free in Mozilla Firefox's CSS parsing engine enables unauthenticated remote code execution with no user interaction required, affecting Firefox versions below 149, ESR 115.34, and ESR 140.9. An attacker can exploit this memory corruption vulnerability by crafting a malicious web page that triggers the vulnerability when rendered, achieving full system compromise. No patch is currently available.

A sandbox escape vulnerability exists in Mozilla Firefox due to incorrect boundary conditions and integer overflow within the XPCOM component, allowing attackers to break out of the browser's security sandbox and potentially execute arbitrary code with elevated privileges. Firefox versions below 149, Firefox ESR below 115.34, and Firefox ESR below 140.9 are affected. An attacker capable of triggering the integer overflow in XPCOM can exploit the boundary condition flaw to escape the sandbox, potentially leading to full system compromise depending on browser privilege level and operating system context.

A sandbox escape vulnerability exists in Firefox's XPCOM component due to incorrect boundary conditions and integer overflow, allowing attackers to bypass security sandboxing mechanisms. This affects Firefox versions below 149, Firefox ESR below 115.34, and Firefox ESR below 140.9. An attacker can exploit this flaw to escape the browser sandbox and potentially execute arbitrary code with elevated privileges on the affected system.

Sandbox escape in Mozilla Firefox's Disability Access APIs component due to a use-after-free memory vulnerability allows unauthenticated remote attackers to execute arbitrary code with full system compromise. Firefox versions below 149 and Firefox ESR below 140.9 are affected, with no patch currently available. The vulnerability is exploitable over the network without user interaction, presenting critical risk to all affected users.

A sandbox escape vulnerability exists in Firefox's Telemetry component due to incorrect boundary condition handling, allowing attackers to potentially break out of the browser sandbox and access system resources or sensitive data. This affects Firefox versions below 149, Firefox ESR below 115.34, and Firefox ESR below 140.9. The vulnerability enables information disclosure and potentially arbitrary code execution by circumventing the sandbox isolation mechanism that normally restricts browser processes.

An incorrect boundary condition vulnerability exists in Firefox's Graphics Canvas2D component that can lead to information disclosure. This affects Firefox versions prior to 149, Firefox ESR versions prior to 115.34, and Firefox ESR versions prior to 140.9. An attacker can exploit this boundary condition issue to disclose sensitive information through crafted Canvas2D operations, though no active exploitation or public proof-of-concept has been reported at this time.

This vulnerability involves incorrect boundary conditions in Firefox's Graphics Canvas2D component that enables information disclosure. Firefox versions prior to 149, Firefox ESR prior to 115.34, and Firefox ESR prior to 140.9 are affected. An attacker can leverage improper boundary validation in Canvas2D operations to read sensitive information from memory that should not be accessible through normal web content restrictions.

Mozilla Firefox's WebRender graphics component contains a race condition and use-after-free vulnerability that enables remote code execution when a user visits a malicious webpage. The flaw affects Firefox versions prior to 149, Firefox ESR versions before 115.34 and 140.9, and requires user interaction to trigger. No patch is currently available for this high-severity issue.

By checking the result of calls to `window.open` with specifically set protocol handlers, an attacker could determine if the application which implements that protocol handler is installed. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

A missing delay in directory upload UI could have made it possible for an attacker to trick a user into granting permission via clickjacking. Rated medium severity (CVSS 6.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

An attacker could, via a specially crafted multipart response, execute arbitrary JavaScript under the `resource://devtools` origin. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

An attacker could, via a specially crafted multipart response, execute arbitrary JavaScript under the `resource://pdf.js` origin. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Memory safety bugs present in Firefox 129, Firefox ESR 128.1, and Thunderbird 128.1. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

If a site had been granted the permission to open popup windows, it could cause Select elements to appear on top of another site to perform a spoofing attack. Rated medium severity (CVSS 6.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

A difference in the handling of StructFields and ArrayTypes in WASM could be used to trigger an exploitable type confusion vulnerability. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Firefox normally asks for confirmation before asking the operating system to find an application to handle a scheme that the browser does not support. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Internal browser event interfaces were exposed to web content when privileged EventHandler listener callbacks ran for those events. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

A potentially exploitable type confusion could be triggered when looking up a property name on an object being used as the `with` environment. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Calling `PK11_Encrypt()` in NSS using CKM_CHACHA20 and the same buffer for input and output can result in plaintext on an Intel Sandy Bridge processor. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

The date picker could partially obscure security prompts. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Incorrect garbage collection interaction in IndexedDB could have led to a use-after-free. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

ANGLE failed to initialize parameters which lead to reading from uninitialized memory. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

It was possible for a web extension with minimal permissions to create a `StreamFilter` which could be used to read and modify the response body of requests on any site. Rated high severity (CVSS 8.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Firefox adds web-compatibility shims in place of some tracking scripts blocked by Enhanced Tracking Protection. Rated medium severity (CVSS 6.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Editor code failed to check an attribute value. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Incomplete WebAssembly exception handing could have led to a use-after-free. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

A type confusion bug in WebAssembly could be leveraged by an attacker to potentially achieve code execution. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Insufficient checks when processing graphics shared memory could have led to memory corruption. Rated critical severity (CVSS 9.6), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Select options could obscure the fullscreen notification dialog. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

By tricking the browser with a `X-Frame-Options` header, a sandboxed iframe could have presented a button that, if clicked by a user, would bypass restrictions to open a new window. Rated medium severity (CVSS 4.7), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

By monitoring the time certain operations take, an attacker could have guessed which external protocol handlers were functional on a user's system. Rated medium severity (CVSS 4.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Memory safety bugs present in Firefox 121, Firefox ESR 115.6, and Thunderbird 115.6. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

In specific HSTS configurations an attacker could have bypassed HSTS on a subdomain. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

A malicious devtools extension could have been used to escalate privileges. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

A bug in popup notifications delay calculation could have made it possible for an attacker to trick a user into granting permissions. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

A phishing site could have repurposed an `about:` dialog to show phishing content with an incorrect origin in the address bar. Rated medium severity (CVSS 4.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

When a parent page loaded a child in an iframe with `unsafe-inline`, the parent Content Security Policy could have overridden the child Content Security Policy. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

A Linux user opening the print preview dialog could have caused the browser to crash. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

It was possible for certain browser prompts and dialogs to be activated or dismissed unintentionally by the user due to an incorrect timestamp used to prevent input after page load. Rated medium severity (CVSS 4.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

An out of bounds write in ANGLE could have allowed an attacker to corrupt memory leading to a potentially exploitable crash. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

The timing of a button click causing a popup to disappear was approximately the same length as the anti-clickjacking delay on permission prompts. Rated medium severity (CVSS 6.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

`EncryptingOutputStream` was susceptible to exposing uninitialized data. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Memory safety bugs present in Firefox 120, Firefox ESR 115.5, and Thunderbird 115.5. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

The `ShutdownObserver()` was susceptible to potentially undefined behavior due to its reliance on a dynamic type that lacked a virtual destructor. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

A use-after-free was identified in the `nsDNSService::Init`. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

The `nsWindow::PickerOpen(void)` method was susceptible to a heap buffer overflow when running in headless mode. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

The `VideoBridge` allowed any content process to use textures produced by remote decoders. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

A use-after-free condition affected TLS socket creation when under memory pressure. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Firefox was susceptible to a heap buffer overflow in `nsTextFragment` due to insufficient OOM handling. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

When resolving a symlink, a race may occur where the buffer passed to `readlink` may actually be smaller than necessary. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, no authentication required. No vendor patch available.

The WebGL `DrawElementsInstanced` method was susceptible to a heap buffer overflow when used on systems with the Mesa VM driver. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Memory safety bugs present in Firefox 119, Firefox ESR 115.4, and Thunderbird 115.4. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Relative URLs starting with three slashes were incorrectly parsed, and a path-traversal "/../" part in the path could be used to override the specified host. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

When using X11, text selected by the page using the Selection API was erroneously copied into the primary selection, a temporary storage not unlike the clipboard. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Ownership mismanagement led to a use-after-free in ReadableByteStreams This vulnerability affects Firefox < 120, Firefox ESR < 115.5.0, and Thunderbird < 115.5. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

The black fade animation when exiting fullscreen is roughly the length of the anti-clickjacking delay on permission prompts. Rated medium severity (CVSS 5.4), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

It was possible to cause the use of a MessagePort after it had already been freed, which could potentially have led to an exploitable crash. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

On some systems-depending on the graphics settings and drivers-it was possible to force an out-of-bounds read and leak memory data into the images created on the canvas element. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

An attacker could have created a malicious link using bidirectional characters to spoof the location in the address bar when visited. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Memory safety bugs present in Firefox 118, Firefox ESR 115.3, and Thunderbird 115.3. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

During garbage collection extra operations were performed on a object that should not be. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

The executable file warning was not presented when downloading .msix, .msixbundle, .appx, and .appxbundle files, which can run commands on a user's computer. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

A website could have obscured the full screen notification by using the file open dialog. Rated medium severity (CVSS 4.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

A malicious installed WebExtension could open arbitrary URLs, which under the right circumstance could be leveraged to collect sensitive user data. Rated medium severity (CVSS 4.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Drivers are not always robust to extremely large draw calls and in some cases this scenario could have led to a crash. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

It was possible for certain browser prompts and dialogs to be activated or dismissed unintentionally by the user due to an insufficient activation-delay. Rated medium severity (CVSS 4.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Memory safety bugs present in Firefox 117, Firefox ESR 115.2, and Thunderbird 115.2. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

If Windows failed to duplicate a handle during process creation, the sandbox code may have inadvertently freed a pointer twice, resulting in a use-after-free and a potentially exploitable crash. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

During Ion compilation, a Garbage Collection could have resulted in a use-after-free condition, allowing an attacker to write two NUL bytes, and cause a potentially exploitable crash. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. This Use After Free vulnerability could allow attackers to access freed memory to execute arbitrary code or crash the application.

A compromised content process could have provided malicious data in a `PathRecording` resulting in an out-of-bounds write, leading to a potentially exploitable crash in a privileged process. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity.

A compromised content process could have provided malicious data to `FilterNodeD2D1` resulting in an out-of-bounds write, leading to a potentially exploitable crash in a privileged process. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Memory safety bugs present in Firefox 116, Firefox ESR 115.1, and Thunderbird 115.1. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Memory safety bugs present in Firefox 116, Firefox ESR 102.14, Firefox ESR 115.1, Thunderbird 102.14, and Thunderbird 115.1. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

When checking if the Browsing Context had been discarded in `HttpBaseChannel`, if the load group was not available then it was assumed to have already been discarded which was not always the case for. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Due to large allocation checks in Angle for glsl shaders being too lenient a buffer overflow could have occurred when allocating too much private shader memory on mac OS. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Excel `.xll` add-in files did not have a blocklist entry in Firefox's executable blocklist which allowed them to be downloaded without any warning of their potential harm. Rated medium severity (CVSS 4.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.