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Fencer Intel
medium 4.3

CVE-2011-2983 json

Mozilla Firefox before 3.6.20, Thunderbird 2.x and 3.x before 3.1.12, SeaMonkey 1.x and 2.x, and possibly other products does not properly…

published 2011-08-18 15 y ago modified 2026-06-16 4 mo ago also EUVD-2011-2951

cvss
4.3
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.6%
EPSS 1.6% chance of exploitation in 30 days, percentile 75%
public exploits
0
none known

Summary

Mozilla Firefox before 3.6.20, Thunderbird 2.x and 3.x before 3.1.12, SeaMonkey 1.x and 2.x, and possibly other products does not properly handle the RegExp.input property, which allows remote attackers to bypass the Same Origin Policy and read data from a different domain via a crafted web site, possibly related to a use-after-free.

Patch / fix

  • seamonkey RHEL 4 1.0.9-72.el4
  • seamonkey-chat RHEL 4 1.0.9-72.el4
  • seamonkey-mail RHEL 4 1.0.9-72.el4
  • seamonkey-js-debugger RHEL 4 1.0.9-72.el4
  • seamonkey-dom-inspector RHEL 4 1.0.9-72.el4
  • thunderbird RHEL 4 1.5.0.12-40.el4
  • thunderbird RHEL 5 PRODUCTIVITY, RHEL 5 2.0.0.24-21.el5
  • firefox RHEL 4 3.6.20-2.el4

red hat advisories RHSA-2011:1167RHSA-2011:1165RHSA-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-2011-2983 updated cvss 6.8

Mozilla: Private data leakage using RegExp.input

  • 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, seamonkey 1.0.9-72.el4, seamonkey-chat 1.0.9-72.el4, seamonkey-mail 1.0.9-72.el4, thunderbird 1.5.0.12-40.el4, seamonkey-js-debugger 1.0.9-72.el4, +1 more Red Hat Enterprise Linux Desktop (v. 5 client) firefox 3.6.20-2.el5, xulrunner 1.9.2.20-2.el5, thunderbird 2.0.0.24-21.el5 Red Hat Enterprise Linux Desktop version 4 firefox 3.6.20-2.el4, seamonkey 1.0.9-72.el4, seamonkey-chat 1.0.9-72.el4, seamonkey-mail 1.0.9-72.el4, thunderbird 1.5.0.12-40.el4, seamonkey-js-debugger 1.0.9-72.el4, +1 more 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, seamonkey 1.0.9-72.el4, seamonkey-chat 1.0.9-72.el4, seamonkey-mail 1.0.9-72.el4, thunderbird 1.5.0.12-40.el4, seamonkey-js-debugger 1.0.9-72.el4, +1 more
    fixed: vendor fix RHSA-2011:1164
  • Red Hat Enterprise Linux Optional Productivity Applications (v. 5 server) thunderbird 2.0.0.24-21.el5
    fixed: vendor fix RHSA-2011:1165
  • 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, seamonkey 1.0.9-72.el4, seamonkey-chat 1.0.9-72.el4, seamonkey-mail 1.0.9-72.el4, thunderbird 1.5.0.12-40.el4, seamonkey-js-debugger 1.0.9-72.el4, +1 more
    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

1.59% chance of exploitation in the next 30 days, higher than 75% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:P/I:N/A:N

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

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.