CVE-2012-4187

critical

Published 2012-10-10 · Modified 2026-04-29

CVSS v3

—

CVSS v2

9.3

VIR risk

9.3

Description

Mozilla Firefox before 16.0, Firefox ESR 10.x before 10.0.8, Thunderbird before 16.0, Thunderbird ESR 10.x before 10.0.8, and SeaMonkey before 2.13 do not properly manage a certain insPos variable, which allows remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption and assertion failure) via unspecified vectors.

Predictions

Exploit likelihood

20%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: cve@mitre.org — http://www.mozilla.org/security/announce/2012/mfsa2012-86.html

OS impact

OS	Version	Status
rhel	5.0	affected
rhel	6.0	affected
rhel	6.3	affected
ubuntu	10.04	affected
ubuntu	11.04	affected
ubuntu	11.10	affected
ubuntu	12.04	affected
suse	10	affected
suse	11	affected

Application impact

Vendor	Product	Versions	Fixed
mozilla	firefox	`{"endExcluding":"10.0.8"}`	`10.0.8`
mozilla	thunderbird_esr	`{"endExcluding":"10.0.8"}`	`10.0.8`
mozilla	thunderbird	`{"endExcluding":"16.0"}`	`16.0`
mozilla	seamonkey	`{"endExcluding":"2.13"}`	`2.13`

References

CWEs

CWE-119

Verify integrity in audit chain (admin only). AS-IS.