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Firefox CVE-2026-6753

| EUVDEUVD-2026-24094 HIGH
Buffer Overflow (CWE-119)
2026-04-21 mozilla GHSA-q45f-ggxw-3qq8
Buffer Overflow Mozilla
7.3
CVSS 3.1 · Vendor: mozilla
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Severity by source

Vendor (mozilla) PRIMARY
7.3 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
SUSE
HIGH
qualitative
Red Hat
7.5 HIGH
qualitative

Primary rating from Vendor (mozilla).

CVSS VectorVendor: mozilla

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low

Lifecycle Timeline

6
Patch released
Apr 29, 2026 - 02:30 nvd
Patch available
Analysis Generated
Apr 23, 2026 - 00:14 vuln.today
CVSS changed
Apr 22, 2026 - 16:22 NVD
7.3 (HIGH)
EUVD ID Assigned
Apr 21, 2026 - 13:15 euvd
EUVD-2026-24094
Analysis Generated
Apr 21, 2026 - 13:15 vuln.today
CVE Published
Apr 21, 2026 - 12:40 nvd
HIGH 7.3

DescriptionCVE.org

Incorrect boundary conditions in the WebRTC component. This vulnerability was fixed in Firefox 150 and Firefox ESR 140.10.

AnalysisAI

Remote attackers can execute code and corrupt memory in Firefox (versions prior to 150) and Firefox ESR (prior to 140.10) by exploiting boundary condition errors in the WebRTC component. The vulnerability permits network-based exploitation without authentication or user interaction, enabling partial confidentiality, integrity, and availability impact. EPSS score of 0.02% (5th percentile) indicates low observed exploitation probability despite the high CVSS 7.3 rating. No public exploit identified at time of analysis, though the vulnerability is classified as automatable with total technical impact per SSVC framework. Mozilla has released patches in Firefox 150 and Firefox ESR 140.10.

Technical ContextAI

This vulnerability affects Mozilla Firefox's WebRTC (Web Real-Time Communication) implementation, which enables peer-to-peer audio, video, and data sharing in web browsers. The root cause is CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer), a classic buffer overflow class where incorrect boundary validation allows data to be written or read beyond allocated memory regions. The CPE string cpe:2.3:a:mozilla:firefox identifies the affected product as Mozilla Firefox browser across multiple versions. WebRTC operates at the browser API level, processing network media streams and data channels, making boundary condition errors particularly critical as they directly interface with untrusted network input. The vulnerability classification as a buffer overflow suggests that improper bounds checking in WebRTC's media handling, codec processing, or network protocol parsing could allow memory corruption leading to code execution or information disclosure.

RemediationAI

Upgrade immediately to Firefox 150 or later for standard release channel users, or Firefox ESR 140.10 or later for ESR channel deployments. Mozilla has released vendor-confirmed patches in these versions addressing the WebRTC boundary condition vulnerability, as documented in security advisories MFSA2026-30 through MFSA2026-34 available at https://www.mozilla.org/security/advisories/. Enterprise environments using Firefox ESR should prioritize the 140.10 update through existing patch management systems. For organizations unable to patch immediately, compensating controls include disabling WebRTC functionality through Firefox configuration settings (media.peerconnection.enabled set to false in about:config), though this breaks legitimate WebRTC applications including video conferencing tools, VoIP services, and peer-to-peer file sharing features. Network-level mitigation through WebRTC media server proxies can reduce direct peer exposure but adds infrastructure complexity. Verify patched versions through Firefox's About dialog or automated asset inventory systems checking browser.version properties.

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Same weakness CWE-119 – Buffer Overflow

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Same technique Buffer Overflow

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Vendor StatusVendor

SUSE

Severity: High
Product Status
SUSE Liberty Linux 10 Fixed
SUSE Liberty Linux 8 Fixed
SUSE Liberty Linux 9 Fixed
SUSE Linux Enterprise Server 16.0 SUSE Linux Enterprise Server for SAP applications 16.0 Fixed
openSUSE Leap 16.0 Fixed

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CVE-2026-6753 vulnerability details – vuln.today
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