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Fencer Vulns
critical 10.0

CVE-2009-0775 json

Double free vulnerability in Mozilla Firefox before 3.0.7, Thunderbird before 2.0.0.21, and SeaMonkey before 1.1.15 allows remote attackers…

published 2009-03-05 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-0775

cvss
10.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.7%
EPSS 4.7% chance of exploitation in 30 days, percentile 91%
public exploits
0
none known

Summary

Double free vulnerability in Mozilla Firefox before 3.0.7, Thunderbird before 2.0.0.21, and SeaMonkey before 1.1.15 allows remote attackers to execute arbitrary code via "cloned XUL DOM elements which were linked as a parent and child," which are not properly handled during garbage collection.

Patch / fix

  • seamonkey RHEL 2.1 1.0.9-0.30.el2
  • seamonkey RHEL 3 1.0.9-0.34.el3
  • seamonkey RHEL 4 1.0.9-38.el4
  • seamonkey-nss RHEL 2.1 1.0.9-0.30.el2
  • seamonkey-nss RHEL 3 1.0.9-0.34.el3
  • seamonkey-chat RHEL 2.1 1.0.9-0.30.el2
  • seamonkey-chat RHEL 3 1.0.9-0.34.el3
  • seamonkey-chat RHEL 4 1.0.9-38.el4

red hat advisories RHSA-2009:0325RHSA-2009:0315RHSA-2009:0258

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 50.1.0-1.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:10071-1

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-2009-0775 updated cvss 6.8

Firefox XUL Linked Clones Double Free Vulnerability

  • Red Hat Desktop version 3 seamonkey 1.0.9-0.34.el3, seamonkey-nss 1.0.9-0.34.el3, seamonkey-chat 1.0.9-0.34.el3, seamonkey-mail 1.0.9-0.34.el3, seamonkey-nspr 1.0.9-0.34.el3, seamonkey-js-debugger 1.0.9-0.34.el3, +1 more
    fixed: vendor fix RHSA-2009:0325
  • Red Hat Enterprise Linux (v. 5 server) firefox 3.0.7-1.el5, xulrunner 1.9.0.7-1.el5, xulrunner-devel-unstable 1.9.0.7-1.el5
    fixed: vendor fix RHSA-2009:0315
  • Red Hat Enterprise Linux AS (Advanced Server) version 2.1 seamonkey 1.0.9-0.30.el2, seamonkey-nss 1.0.9-0.30.el2, seamonkey-chat 1.0.9-0.30.el2, seamonkey-mail 1.0.9-0.30.el2, seamonkey-nspr 1.0.9-0.30.el2, seamonkey-js-debugger 1.0.9-0.30.el2, +1 more Red Hat Enterprise Linux AS version 3 seamonkey 1.0.9-0.34.el3, seamonkey-nss 1.0.9-0.34.el3, seamonkey-chat 1.0.9-0.34.el3, seamonkey-mail 1.0.9-0.34.el3, seamonkey-nspr 1.0.9-0.34.el3, seamonkey-js-debugger 1.0.9-0.34.el3, +1 more Red Hat Enterprise Linux AS version 4 firefox 3.0.7-1.el4, seamonkey 1.0.9-38.el4, seamonkey-chat 1.0.9-38.el4, seamonkey-mail 1.0.9-38.el4, thunderbird 1.5.0.12-19.el4, seamonkey-js-debugger 1.0.9-38.el4, +1 more
    fixed: vendor fix RHSA-2009:0325
  • Red Hat Enterprise Linux Desktop (v. 5 client) firefox 3.0.7-1.el5, xulrunner 1.9.0.7-1.el5, thunderbird 2.0.0.21-1.el5, xulrunner-devel-unstable 1.9.0.7-1.el5
    fixed: vendor fix RHSA-2009:0315
  • Red Hat Enterprise Linux Desktop version 4 firefox 3.0.7-1.el4, seamonkey 1.0.9-38.el4, seamonkey-chat 1.0.9-38.el4, seamonkey-mail 1.0.9-38.el4, thunderbird 1.5.0.12-19.el4, seamonkey-js-debugger 1.0.9-38.el4, +1 more
    fixed: vendor fix RHSA-2009:0325
  • Red Hat Enterprise Linux Desktop Workstation (v. 5 client) xulrunner 1.9.0.7-1.el5, xulrunner-devel-unstable 1.9.0.7-1.el5
    fixed: vendor fix RHSA-2009:0315
  • Red Hat Enterprise Linux ES version 2.1 seamonkey 1.0.9-0.30.el2, seamonkey-nss 1.0.9-0.30.el2, seamonkey-chat 1.0.9-0.30.el2, seamonkey-mail 1.0.9-0.30.el2, seamonkey-nspr 1.0.9-0.30.el2, seamonkey-js-debugger 1.0.9-0.30.el2, +1 more Red Hat Enterprise Linux ES version 3 seamonkey 1.0.9-0.34.el3, seamonkey-nss 1.0.9-0.34.el3, seamonkey-chat 1.0.9-0.34.el3, seamonkey-mail 1.0.9-0.34.el3, seamonkey-nspr 1.0.9-0.34.el3, seamonkey-js-debugger 1.0.9-0.34.el3, +1 more Red Hat Enterprise Linux ES version 4 firefox 3.0.7-1.el4, seamonkey 1.0.9-38.el4, seamonkey-chat 1.0.9-38.el4, seamonkey-mail 1.0.9-38.el4, thunderbird 1.5.0.12-19.el4, seamonkey-js-debugger 1.0.9-38.el4, +1 more
    fixed: vendor fix RHSA-2009:0325
  • Red Hat Enterprise Linux Optional Productivity Applications (v. 5 server) thunderbird 2.0.0.21-1.el5
    fixed: vendor fix RHSA-2009:0258
show 1 more
  • Red Hat Enterprise Linux WS version 2.1 seamonkey 1.0.9-0.30.el2, seamonkey-nss 1.0.9-0.30.el2, seamonkey-chat 1.0.9-0.30.el2, seamonkey-mail 1.0.9-0.30.el2, seamonkey-nspr 1.0.9-0.30.el2, seamonkey-js-debugger 1.0.9-0.30.el2, +1 more Red Hat Enterprise Linux WS version 3 seamonkey 1.0.9-0.34.el3, seamonkey-nss 1.0.9-0.34.el3, seamonkey-chat 1.0.9-0.34.el3, seamonkey-mail 1.0.9-0.34.el3, seamonkey-nspr 1.0.9-0.34.el3, seamonkey-js-debugger 1.0.9-0.34.el3, +1 more Red Hat Enterprise Linux WS version 4 firefox 3.0.7-1.el4, seamonkey 1.0.9-38.el4, seamonkey-chat 1.0.9-38.el4, seamonkey-mail 1.0.9-38.el4, thunderbird 1.5.0.12-19.el4, seamonkey-js-debugger 1.0.9-38.el4, +1 more Red Hat Linux Advanced Workstation 2.1 seamonkey 1.0.9-0.30.el2, seamonkey-nss 1.0.9-0.30.el2, seamonkey-chat 1.0.9-0.30.el2, seamonkey-mail 1.0.9-0.30.el2, seamonkey-nspr 1.0.9-0.30.el2, seamonkey-js-debugger 1.0.9-0.30.el2, +1 more
    fixed: vendor fix RHSA-2009:0325

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

Exploit prediction

4.71% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 2.0 10.0 AV:N/AC:L/Au:N/C:C/I:C/A:C

Classification

Weakness
  • CWE-399 Resource Management Errors

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.