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Fencer Intel
critical 9.3

CVE-2012-1939 json

jsinfer.cpp in Mozilla Firefox ESR 10.x before 10.0.5 and Thunderbird ESR 10.x before 10.0.5 does not properly determine data types, which…

published 2012-06-05 14 y ago modified 2026-06-16 4 mo ago also EUVD-2012-1948

cvss
9.3
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.1%
EPSS 3.1% chance of exploitation in 30 days, percentile 87%
public exploits
0
none known

Summary

jsinfer.cpp in Mozilla Firefox ESR 10.x before 10.0.5 and Thunderbird ESR 10.x before 10.0.5 does not properly determine data types, which allows remote attackers to cause a denial of service (memory corruption and application crash) or possibly execute arbitrary code via crafted JavaScript code.

Patch / fix

  • thunderbird RHEL 5 PRODUCTIVITY, RHEL 5 10.0.5-2.el5_8
  • thunderbird RHEL 6 10.0.5-2.el6_2
  • firefox RHEL 5 10.0.5-1.el5_8
  • firefox RHEL 6 10.0.5-1.el6_2
  • xulrunner RHEL 5 10.0.5-1.el5_8
  • xulrunner RHEL 6 10.0.5-1.el6_2

red hat advisories RHSA-2012:0715RHSA-2012:0710

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-2012-1939 updated cvss 6.8

Mozilla: Miscellaneous memory safety hazards (rv:13.0/ rv:10.0.5) (MFSA 2012-34)

  • Red Hat Enterprise Linux (v. 5 server) firefox 10.0.5-1.el5_8, xulrunner 10.0.5-1.el5_8 Red Hat Enterprise Linux Desktop (v. 5 client) firefox 10.0.5-1.el5_8, xulrunner 10.0.5-1.el5_8, thunderbird 10.0.5-2.el5_8 Red Hat Enterprise Linux Desktop (v. 6) firefox 10.0.5-1.el6_2, xulrunner 10.0.5-1.el6_2, thunderbird 10.0.5-2.el6_2 Red Hat Enterprise Linux Desktop Optional (v. 6) xulrunner 10.0.5-1.el6_2 Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox 10.0.5-1.el6_2, xulrunner 10.0.5-1.el6_2 Red Hat Enterprise Linux Server (v. 6) firefox 10.0.5-1.el6_2, xulrunner 10.0.5-1.el6_2
    +4 more products
    Red Hat Enterprise Linux Server Optional (v. 6) xulrunner 10.0.5-1.el6_2, thunderbird 10.0.5-2.el6_2 Red Hat Enterprise Linux Workstation (v. 6) firefox 10.0.5-1.el6_2, xulrunner 10.0.5-1.el6_2, thunderbird 10.0.5-2.el6_2 Red Hat Enterprise Linux Workstation Optional (v. 6) xulrunner 10.0.5-1.el6_2 Red Hat RHEL Desktop Workstation (v. 5 client) xulrunner 10.0.5-1.el5_8
    fixed: vendor fix RHSA-2012:0710
  • Red Hat RHEL Optional Productivity Applications (v. 5 server) thunderbird 10.0.5-2.el5_8
    fixed: vendor fix RHSA-2012:0715

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

3.12% chance of exploitation in the next 30 days, higher than 87% 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
  • 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.