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Fencer Vulns
high 7.6

CVE-2006-4253 in the critical feed json

Concurrency vulnerability in Mozilla Firefox 1.5.0.6 and earlier allows remote attackers to cause a denial of service (crash) and possibly…

published 2006-08-21 20 y ago modified 2026-06-16 4 mo ago also EUVD-2006-4241

cvss
7.6
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
15.2%
EPSS 15.2% chance of exploitation in 30 days, percentile 96%
public exploits
1
Exploit-DB

Summary

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.

Patch / fix

  • thunderbird Debian 14, Debian 13, Debian 12 1.5.0.7-1

debian advisories DEBIAN-CVE-2006-4253

  • thunderbird RHEL 4 1.5.0.7-0.1.el4
  • seamonkey RHEL 3 1.0.5-0.1.el3
  • seamonkey RHEL 4 1.0.5-0.1.el4
  • devhelp RHEL 4 0.10-0.4.el4
  • seamonkey-nss RHEL 3 1.0.5-0.1.el3
  • seamonkey-chat RHEL 3 1.0.5-0.1.el3
  • seamonkey-chat RHEL 4 1.0.5-0.1.el4
  • seamonkey-mail RHEL 3 1.0.5-0.1.el3

red hat advisories RHSA-2006:0677RHSA-2006:0676RHSA-2006:0675

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2006-4253 updated

security flaw

  • Red Hat Desktop version 3 seamonkey 1.0.5-0.1.el3, seamonkey-nss 1.0.5-0.1.el3, seamonkey-chat 1.0.5-0.1.el3, seamonkey-mail 1.0.5-0.1.el3, seamonkey-nspr 1.0.5-0.1.el3, seamonkey-js-debugger 1.0.5-0.1.el3, +1 more Red Hat Enterprise Linux AS version 3 seamonkey 1.0.5-0.1.el3, seamonkey-nss 1.0.5-0.1.el3, seamonkey-chat 1.0.5-0.1.el3, seamonkey-mail 1.0.5-0.1.el3, seamonkey-nspr 1.0.5-0.1.el3, seamonkey-js-debugger 1.0.5-0.1.el3, +1 more Red Hat Enterprise Linux AS version 4 devhelp 0.10-0.4.el4, firefox 1.5.0.7-0.1.el4, seamonkey 1.0.5-0.1.el4, thunderbird 1.5.0.7-0.1.el4, seamonkey-chat 1.0.5-0.1.el4, seamonkey-mail 1.0.5-0.1.el4, +2 more Red Hat Enterprise Linux Desktop version 4 devhelp 0.10-0.4.el4, firefox 1.5.0.7-0.1.el4, seamonkey 1.0.5-0.1.el4, thunderbird 1.5.0.7-0.1.el4, seamonkey-chat 1.0.5-0.1.el4, seamonkey-mail 1.0.5-0.1.el4, +2 more Red Hat Enterprise Linux ES version 3 seamonkey 1.0.5-0.1.el3, seamonkey-nss 1.0.5-0.1.el3, seamonkey-chat 1.0.5-0.1.el3, seamonkey-mail 1.0.5-0.1.el3, seamonkey-nspr 1.0.5-0.1.el3, seamonkey-js-debugger 1.0.5-0.1.el3, +1 more Red Hat Enterprise Linux ES version 4 devhelp 0.10-0.4.el4, firefox 1.5.0.7-0.1.el4, seamonkey 1.0.5-0.1.el4, thunderbird 1.5.0.7-0.1.el4, seamonkey-chat 1.0.5-0.1.el4, seamonkey-mail 1.0.5-0.1.el4, +2 more
    +2 more products
    Red Hat Enterprise Linux WS version 3 seamonkey 1.0.5-0.1.el3, seamonkey-nss 1.0.5-0.1.el3, seamonkey-chat 1.0.5-0.1.el3, seamonkey-mail 1.0.5-0.1.el3, seamonkey-nspr 1.0.5-0.1.el3, seamonkey-js-debugger 1.0.5-0.1.el3, +1 more Red Hat Enterprise Linux WS version 4 devhelp 0.10-0.4.el4, firefox 1.5.0.7-0.1.el4, seamonkey 1.0.5-0.1.el4, thunderbird 1.5.0.7-0.1.el4, seamonkey-chat 1.0.5-0.1.el4, seamonkey-mail 1.0.5-0.1.el4, +2 more
    fixed: vendor fix RHSA-2006:0676

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Timeline

  1. First public exploit (EDB-28380)
  2. Published

Exploit prediction

15.19% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-28380 Mozilla Firefox 1.0.x - JavaScript Handler Race Condition Memory Corruption dos, 2006-08-12

CVSS scores

assigned by version score vector
NVD 2.0 7.6 AV:N/AC:H/Au:N/C:C/I:C/A:C

Classification

Weakness
  • CWE-264 Permissions, Privileges, and Access Controls

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.