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.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | thunderbird | 1.5.0.7-1 | — |
| Debian 13 | thunderbird | 1.5.0.7-1 | — |
| Debian 12 | thunderbird | 1.5.0.7-1 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 4 | devhelp +1 | 0.10-0.4.el4 | RHSA-2006:0676 |
| RHEL 4 | firefox +1 | 1.5.0.7-0.1.el4 | RHSA-2006:0677, RHSA-2006:0675 |
| RHEL 4 | seamonkey +5 | 1.0.5-0.1.el4 | RHSA-2006:0676 |
| RHEL 3 | seamonkey +9 | 1.0.5-0.1.el3 | RHSA-2006:0676 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Exploit-DB 1
- Mozilla Firefox 1.0.x - JavaScript Handler Race Condition Memory Corruption EDB-28380 · dos · Aug 12, 2006 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 3
- RHSA-2006:0676 Red Hat Security Advisory: seamonkey security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2006:0677 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2006:0675 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
References
- 20061017 Flaw in Firefox 2.0 RC2 mailing-list
- 20060817 Re: [VulnWatch] Re: Concurrency-related vulnerabilities in browsers - expect problems mailing-list
- 1016847 vdb-entry
- 22391 third-party-advisory
- ADV-2006-3748 vdb-entry
- RHSA-2006:0676 vendor-advisory
- http://www.mozilla.org/security/announce/2006/mfsa2006-59.html
- http://lcamtuf.coredump.cx/ffoxdie.html
- 22055 third-party-advisory
- 22195 third-party-advisory
- oval:org.mitre.oval:def:9528 vdb-entry signature
- USN-352-1 vendor-advisory
- 21513 third-party-advisory
- 21950 third-party-advisory
- USN-351-1 vendor-advisory
- 22025 third-party-advisory
- 22056 third-party-advisory
- MDKSA-2006:168 vendor-advisory
- 20060812 Concurrency-related vulnerabilities in browsers - expect problems mailing-list
- 22210 third-party-advisory
- 24711 third-party-advisory
- GLSA-200610-04 vendor-advisory
- http://support.avaya.com/elmodocs2/security/ASA-2006-224.htm
- http://www.pianetapc.it/view.php?id=770
- ADV-2008-0083 vdb-entry
- 20060817 RE: [VulnWatch] Re: Concurrency-related vulnerabilities in browsers - expect problems mailing-list
- 21939 third-party-advisory
- 1016848 vdb-entry
- ADV-2006-3617 vdb-entry
- 21915 third-party-advisory
- ADV-2007-1198 vdb-entry
- 20061006 Re: Concurrency-related vulnerabilities in browsers - expect problems mailing-list
- RHSA-2006:0677 vendor-advisory
- GLSA-200609-19 vendor-advisory
- SSRT061181 vendor-advisory
- 20061017 Re: Flaw in Firefox 2.0 RC2 mailing-list
- 22274 third-party-advisory
- RHSA-2006:0675 vendor-advisory
- 21940 third-party-advisory
- 22001 third-party-advisory
- 20060915 rPSA-2006-0169-1 firefox thunderbird mailing-list
- USN-350-1 vendor-advisory
- 21906 third-party-advisory
- 20061019 Re: Flaw in Firefox 2.0 RC2 mailing-list
- GLSA-200610-01 vendor-advisory
- 22074 third-party-advisory
- 22066 third-party-advisory
- 22088 third-party-advisory
- 20060815 Re: Concurrency-related vulnerabilities in browsers - expect problems mailing-list
- 21949 third-party-advisory
- SUSE-SA:2006:054 vendor-advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=348514
- 19534 vdb-entry
- https://issues.rpath.com/browse/RPL-640
- 20061005 Re: Concurrency-related vulnerabilities in browsers - expect problems mailing-list
- http://lcamtuf.coredump.cx/ffoxdie3.html
- 20061025 Mozilla Firefox JavaScript Handler Race Condition Memory Corruption Vulnerability mailing-list
- 22036 third-party-advisory
- 1016846 vdb-entry
- USN-354-1 vendor-advisory