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Fencer Vulns
critical 10.0

CVE-2009-1571 json

Use-after-free vulnerability in the HTML parser in Mozilla Firefox 3.0.x before 3.0.18 and 3.5.x before 3.5.8, Thunderbird before 3.0.2, an…

published 2010-02-21 16 y ago modified 2026-06-16 4 mo ago also EUVD-2009-1567

cvss
10.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
6.5%
EPSS 6.5% chance of exploitation in 30 days, percentile 93%
public exploits
0
none known

Summary

Use-after-free vulnerability in the HTML parser in Mozilla Firefox 3.0.x before 3.0.18 and 3.5.x before 3.5.8, Thunderbird before 3.0.2, and SeaMonkey before 2.0.3 allows remote attackers to execute arbitrary code via unspecified method calls that attempt to access freed objects in low-memory situations.

Patch / fix

  • thunderbird RHEL 4 1.5.0.12-25.el4
  • thunderbird RHEL 5 PRODUCTIVITY, RHEL 5 2.0.0.24-2.el5_4
  • seamonkey RHEL 3 1.0.9-0.50.el3
  • seamonkey RHEL 4 1.0.9-52.el4_8
  • seamonkey-nss RHEL 3 1.0.9-0.50.el3
  • seamonkey-chat RHEL 3 1.0.9-0.50.el3
  • seamonkey-chat RHEL 4 1.0.9-52.el4_8
  • seamonkey-mail RHEL 3 1.0.9-0.50.el3

red hat advisories RHSA-2010:0154RHSA-2010:0153RHSA-2010:0113RHSA-2010:0112

  • MozillaThunderbird openSUSE Tumbleweed 45.5.1-1.1

opensuse advisories openSUSE-SU-2024:10230-1

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-2009-1571 updated cvss 6.8

Mozilla incorrectly frees used memory (MFSA 2010-03)

  • Red Hat Desktop version 3 seamonkey 1.0.9-0.50.el3, seamonkey-nss 1.0.9-0.50.el3, seamonkey-chat 1.0.9-0.50.el3, seamonkey-mail 1.0.9-0.50.el3, seamonkey-nspr 1.0.9-0.50.el3, seamonkey-js-debugger 1.0.9-0.50.el3, +1 more
    fixed: vendor fix RHSA-2010:0113
  • Red Hat Enterprise Linux (v. 5 server) firefox 3.0.18-1.el5_4, xulrunner 1.9.0.18-1.el5_4, xulrunner-devel-unstable 1.9.0.18-1.el5_4
    fixed: vendor fix RHSA-2010:0112
  • Red Hat Enterprise Linux AS version 3 seamonkey 1.0.9-0.50.el3, seamonkey-nss 1.0.9-0.50.el3, seamonkey-chat 1.0.9-0.50.el3, seamonkey-mail 1.0.9-0.50.el3, seamonkey-nspr 1.0.9-0.50.el3, seamonkey-js-debugger 1.0.9-0.50.el3, +1 more Red Hat Enterprise Linux AS version 4 firefox 3.0.18-1.el4, seamonkey 1.0.9-52.el4_8, thunderbird 1.5.0.12-25.el4, seamonkey-chat 1.0.9-52.el4_8, seamonkey-mail 1.0.9-52.el4_8, seamonkey-js-debugger 1.0.9-52.el4_8, +1 more
    fixed: vendor fix RHSA-2010:0113
  • Red Hat Enterprise Linux Desktop (v. 5 client) firefox 3.0.18-1.el5_4, xulrunner 1.9.0.18-1.el5_4, thunderbird 2.0.0.24-2.el5_4, xulrunner-devel-unstable 1.9.0.18-1.el5_4
    fixed: vendor fix RHSA-2010:0112
  • Red Hat Enterprise Linux Desktop version 4 firefox 3.0.18-1.el4, seamonkey 1.0.9-52.el4_8, thunderbird 1.5.0.12-25.el4, seamonkey-chat 1.0.9-52.el4_8, seamonkey-mail 1.0.9-52.el4_8, seamonkey-js-debugger 1.0.9-52.el4_8, +1 more
    fixed: vendor fix RHSA-2010:0113
  • Red Hat Enterprise Linux Desktop Workstation (v. 5 client) xulrunner 1.9.0.18-1.el5_4, xulrunner-devel-unstable 1.9.0.18-1.el5_4
    fixed: vendor fix RHSA-2010:0112
  • Red Hat Enterprise Linux ES version 3 seamonkey 1.0.9-0.50.el3, seamonkey-nss 1.0.9-0.50.el3, seamonkey-chat 1.0.9-0.50.el3, seamonkey-mail 1.0.9-0.50.el3, seamonkey-nspr 1.0.9-0.50.el3, seamonkey-js-debugger 1.0.9-0.50.el3, +1 more Red Hat Enterprise Linux ES version 4 firefox 3.0.18-1.el4, seamonkey 1.0.9-52.el4_8, thunderbird 1.5.0.12-25.el4, seamonkey-chat 1.0.9-52.el4_8, seamonkey-mail 1.0.9-52.el4_8, seamonkey-js-debugger 1.0.9-52.el4_8, +1 more
    fixed: vendor fix RHSA-2010:0113
  • Red Hat Enterprise Linux Optional Productivity Applications (v. 5 server) thunderbird 2.0.0.24-2.el5_4
    fixed: vendor fix RHSA-2010:0153
show 1 more
  • Red Hat Enterprise Linux WS version 3 seamonkey 1.0.9-0.50.el3, seamonkey-nss 1.0.9-0.50.el3, seamonkey-chat 1.0.9-0.50.el3, seamonkey-mail 1.0.9-0.50.el3, seamonkey-nspr 1.0.9-0.50.el3, seamonkey-js-debugger 1.0.9-0.50.el3, +1 more Red Hat Enterprise Linux WS version 4 firefox 3.0.18-1.el4, seamonkey 1.0.9-52.el4_8, thunderbird 1.5.0.12-25.el4, seamonkey-chat 1.0.9-52.el4_8, seamonkey-mail 1.0.9-52.el4_8, seamonkey-js-debugger 1.0.9-52.el4_8, +1 more
    fixed: vendor fix RHSA-2010:0113

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

6.51% chance of exploitation in the next 30 days, higher than 93% 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-94 Improper Control of Generation of Code

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.