What is CVE-2024-21640?

CVE-2024-21640 is a medium-severity vulnerability in Chromiumembedded Cef, classified under Out-of-bounds Read. CVSS score: 5.4/10. Published 2024-01-13.

How severe is CVE-2024-21640?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Out-of-bounds Read in Chromiumembedded Cef

CVE-2024-21640

Chromium Embedded Framework (CEF) is a simple framework for embedding Chromium-based browsers in other applications.`CefVideoConsumerOSR::OnFrameCaptured` does not check `pixel_format` properly, which leads to out-of-bounds read out of the sandbox. This vulnerability was patched in commit 1f55d2e.

Vulnerability class: Buffer Overflow

Published 2024-01-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.006 (44.0th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 44.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Chromiumembedded Cef — versions < commit 1f55d2e
Chromiumembedded Chromium Embedded Framework

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

github.com/chromiumembedded/cef/security/advisories/GHSA-3h3j-38xq-v7hh (Exploit, Vendor Advisory)
github.com/chromiumembedded/cef/commit/1f55d2e12f62cfdfbf9da6968fde2f928982670b (Patch)

Frequently asked questions

What is CVE-2024-21640?: CVE-2024-21640 is a medium-severity vulnerability in Chromiumembedded Cef, classified under Out-of-bounds Read. CVSS score: 5.4/10. Published 2024-01-13.
How severe is CVE-2024-21640?: Medium severity. CVSS v3 base score is 5.4 out of 10.