What is the CVSS score of CVE-2024-21639?

CVE-2024-21639 has a CVSS 3.1 base score of 5.3 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.2%.

Which versions of Chrome are affected by CVE-2024-21639?

CVE-2024-21639 presents moderate security risk, a out-of-bounds read vulnerability rated CVSS 5.3. Exploitation could cause memory corruption or application crashes.. A patch is available.

Is there a public PoC exploit available for CVE-2024-21639?

Yes, a public proof-of-concept exploit is available for CVE-2024-21639. Prioritise patching immediately. EPSS: 0.2%.

How to fix or mitigate CVE-2024-21639?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Vendor patch is available.

Chrome CVE-2024-21639

MEDIUM

Out-of-bounds Read (CWE-125)

2024-01-12 security-advisories@github.com

Buffer Overflow Information Disclosure Chrome Google Chromium Embedded Framework

5.3

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

5.3 MEDIUM

AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 19:34 vuln.today

Patch released

Mar 28, 2026 - 19:34 nvd

Patch available

PoC Detected

Nov 21, 2024 - 08:54 vuln.today

Public exploit code

CVE Published

Jan 12, 2024 - 22:15 nvd

MEDIUM 5.3

DescriptionGitHub Advisory

CEF (Chromium Embedded Framework ) is a simple framework for embedding Chromium-based browsers in other applications. CefLayeredWindowUpdaterOSR::OnAllocatedSharedMemory does not check the size of the shared memory, which leads to out-of-bounds read outside the sandbox. This vulnerability was patched in commit 1f55d2e.

AnalysisAI

CEF (Chromium Embedded Framework ) is a simple framework for embedding Chromium-based browsers in other applications. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable. Public exploit code available.

Technical ContextAI

This vulnerability is classified as Out-of-bounds Read (CWE-125), which allows attackers to read data from memory outside the intended buffer boundaries. CEF (Chromium Embedded Framework ) is a simple framework for embedding Chromium-based browsers in other applications. CefLayeredWindowUpdaterOSR::OnAllocatedSharedMemory does not check the size of the shared memory, which leads to out-of-bounds read outside the sandbox. This vulnerability was patched in commit 1f55d2e. Affected products include: Chromiumembedded Chromium Embedded Framework.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Validate array indices and buffer lengths. Use memory-safe languages. Enable AddressSanitizer during testing.