CVE-2024-21639

Name: CVE-2024-21639
Creator: NVD / NIST
Published: 2024-01-12T22:15:45.75+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.6/10EPSS 0.70%

Last modified Jun 17, 2026

CVE-2024-21639 is a critical-severity vulnerability rated 9.6/10 on the CVSS scale. 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. EPSS estimates a 0.70% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

9.6/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:H

EPSS Probability

0.70%

48.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-125

Affected Software

Vendor	Product	Versions
Chromiumembedded	Chromium Embedded Framework	< 2024-01-05

References

https://github.com/chromiumembedded/cef/commit/1f55d2e12f62cfdfbf9da6968fde2f928982670bPatch
https://github.com/chromiumembedded/cef/security/advisories/GHSA-m375-jw5x-x8mgExploit, Vendor Advisory
https://github.com/chromiumembedded/cef/commit/1f55d2e12f62cfdfbf9da6968fde2f928982670bPatch
https://github.com/chromiumembedded/cef/security/advisories/GHSA-m375-jw5x-x8mgExploit, Vendor Advisory

Timeline

Published: Jan 12, 2024
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2024-21639?

How severe is CVE-2024-21639?

CVE-2024-21639 has a CVSS score of 9.6/10 (CRITICAL severity). The EPSS model estimates a 0.70% probability of exploitation in the next 30 days.

How do I fix CVE-2024-21639?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2024-21639?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST