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Fencer Intel
critical 10.0

CVE-2011-2378 json

The appendChild function in Mozilla Firefox before 3.6.20, Thunderbird 3.x before 3.1.12, SeaMonkey 2.x, and possibly other products does n…

published 2011-08-18 15 y ago modified 2026-06-16 4 mo ago also EUVD-2011-2367

cvss
10.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
5.6%
EPSS 5.6% chance of exploitation in 30 days, percentile 92%
public exploits
0
none known

Summary

The appendChild function in Mozilla Firefox before 3.6.20, Thunderbird 3.x before 3.1.12, SeaMonkey 2.x, and possibly other products does not properly handle DOM objects, which allows remote attackers to execute arbitrary code via unspecified vectors that lead to dereferencing of a "dangling pointer."

Patch / fix

  • thunderbird RHEL 6 3.1.12-1.el6_1
  • firefox RHEL 4 3.6.20-2.el4
  • firefox RHEL 5 3.6.20-2.el5
  • firefox RHEL 6 3.6.20-2.el6_1
  • xulrunner RHEL 5 1.9.2.20-2.el5
  • xulrunner RHEL 6 1.9.2.20-2.el6_1

red hat advisories RHSA-2011:1166RHSA-2011:1164

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-2011-2378 updated cvss 6.8

Mozilla: Dangling pointer vulnerability in appendChild

  • Red Hat Enterprise Linux (v. 5 server) firefox 3.6.20-2.el5, xulrunner 1.9.2.20-2.el5 Red Hat Enterprise Linux AS version 4 firefox 3.6.20-2.el4 Red Hat Enterprise Linux Desktop (v. 5 client) firefox 3.6.20-2.el5, xulrunner 1.9.2.20-2.el5 Red Hat Enterprise Linux Desktop version 4 firefox 3.6.20-2.el4 Red Hat Enterprise Linux Desktop Workstation (v. 5 client) xulrunner 1.9.2.20-2.el5 Red Hat Enterprise Linux ES version 4 firefox 3.6.20-2.el4
    +3 more products
    Red Hat Enterprise Linux Server (v. 6) firefox 3.6.20-2.el6_1, xulrunner 1.9.2.20-2.el6_1 Red Hat Enterprise Linux Server Optional (v. 6) thunderbird 3.1.12-1.el6_1, xulrunner 1.9.2.20-2.el6_1 Red Hat Enterprise Linux WS version 4 firefox 3.6.20-2.el4
    fixed: vendor fix RHSA-2011:1164

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

5.61% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-09).

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 Intel 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.