CVE-2024-21639: Chromiumembedded Chromium Embedded Framework

Critical severity, CVSS 9.6. EPSS: 0.7% chance of exploitation in the next 30 days.

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)

Published 2024-01-12. Last modified 2026-06-17.