What’s Vulnerable › Vulnerabilities

CVE-2024-21639: OOB Access in CefLayeredWindowUpdaterOSR::OnAllocatedSharedMemory

• Severity: critical (CVSS 9.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2024-01-12 · updated 2026-06-17
• Weakness: CWE-125

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.

Affected products

• chromiumembedded Chromium Embedded Framework: before 2024-01-05 — fixed in 2024-01-05

How to fix

Upgrade to a fixed version: chromiumembedded Chromium Embedded Framework 2024-01-05. Check the vendor advisory for mitigations.

References

• https://github.com/chromiumembedded/cef/commit/1f55d2e12f62cfdfbf9da6968fde2f928982670b
• https://github.com/chromiumembedded/cef/security/advisories/GHSA-m375-jw5x-x8mg
• https://github.com/chromiumembedded/cef/commit/1f55d2e12f62cfdfbf9da6968fde2f928982670b
• https://github.com/chromiumembedded/cef/security/advisories/GHSA-m375-jw5x-x8mg

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