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Fencer Intel
critical 9.3

CVE-2011-2981 json

The event-management implementation in Mozilla Firefox before 3.6.20, SeaMonkey 2.x, Thunderbird 3.x before 3.1.12, and possibly other prod…

published 2011-08-18 15 y ago modified 2026-06-16 4 mo ago also EUVD-2011-2949

cvss
9.3
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.3%
EPSS 2.3% chance of exploitation in 30 days, percentile 83%
public exploits
0
none known

Summary

The event-management implementation in Mozilla Firefox before 3.6.20, SeaMonkey 2.x, Thunderbird 3.x before 3.1.12, and possibly other products does not properly select the context for script to run in, which allows remote attackers to bypass the Same Origin Policy or execute arbitrary JavaScript code with chrome privileges via a crafted web site.

Patch / fix

  • 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-2011:1164

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-2011-2981 updated cvss 6.8

Mozilla: Privilege escalation using event handlers

  • 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) 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

2.26% chance of exploitation in the next 30 days, higher than 83% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 9.3 AV:N/AC:M/Au:N/C:C/I:C/A:C

Classification

Weakness

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.