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Fencer Intel
critical 10.0

CVE-2011-0056 json

Buffer overflow in the JavaScript engine in Mozilla Firefox before 3.5.17 and 3.6.x before 3.6.14, and SeaMonkey before 2.0.12, might allow…

published 2011-03-02 15 y ago modified 2026-06-16 4 mo ago also EUVD-2011-0082

cvss
10.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.6%
EPSS 4.6% chance of exploitation in 30 days, percentile 91%
public exploits
0
none known

Summary

Buffer overflow in the JavaScript engine in Mozilla Firefox before 3.5.17 and 3.6.x before 3.6.14, and SeaMonkey before 2.0.12, might allow remote attackers to execute arbitrary code via vectors involving exception timing and a large number of string values, aka an "atom map" issue.

Patch / fix

  • firefox RHEL 4 3.6.14-4.el4
  • firefox RHEL 5 3.6.14-4.el5_6
  • firefox RHEL 6 3.6.14-4.el6_0
  • xulrunner RHEL 5 1.9.2.14-4.el5_6
  • xulrunner RHEL 6 1.9.2.14-3.el6_0

red hat advisories RHSA-2011:0310

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-2011-0056 updated cvss 6.8

Mozilla Buffer overflow in JavaScript atom map (MFSA 2011-05)

  • Red Hat Enterprise Linux (v. 5.6.z server) firefox 3.6.14-4.el5_6, xulrunner 1.9.2.14-4.el5_6 Red Hat Enterprise Linux AS version 4 firefox 3.6.14-4.el4 Red Hat Enterprise Linux Desktop (v. 6) firefox 3.6.14-4.el6_0, xulrunner 1.9.2.14-3.el6_0 Red Hat Enterprise Linux Desktop Optional (v. 6) xulrunner 1.9.2.14-3.el6_0 Red Hat Enterprise Linux Desktop version 4 firefox 3.6.14-4.el4 Red Hat Enterprise Linux ES version 4 firefox 3.6.14-4.el4
    +6 more products
    Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox 3.6.14-4.el6_0, xulrunner 1.9.2.14-3.el6_0 Red Hat Enterprise Linux Server (v. 6) firefox 3.6.14-4.el6_0, xulrunner 1.9.2.14-3.el6_0 Red Hat Enterprise Linux Server Optional (v. 6) xulrunner 1.9.2.14-3.el6_0 Red Hat Enterprise Linux Workstation (v. 6) firefox 3.6.14-4.el6_0, xulrunner 1.9.2.14-3.el6_0 Red Hat Enterprise Linux Workstation Optional (v. 6) xulrunner 1.9.2.14-3.el6_0 Red Hat Enterprise Linux WS version 4 firefox 3.6.14-4.el4
    fixed: vendor fix RHSA-2011:0310

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

4.55% chance of exploitation in the next 30 days, higher than 91% 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-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

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.