CVE-2012-3957

critical

Published 2012-08-29 · Modified 2026-04-29

CVSS v3

—

CVSS v2

10.0

VIR risk

10.0

Description

Heap-based buffer overflow in the nsBlockFrame::MarkLineDirty function in Mozilla Firefox before 15.0, Firefox ESR 10.x before 10.0.7, Thunderbird before 15.0, Thunderbird ESR 10.x before 10.0.7, and SeaMonkey before 2.12 allows remote attackers to execute arbitrary code 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 — https://bugzilla.mozilla.org/show_bug.cgi?id=774548

vendor Authored 2026-05-27

Vendor advisory: cve@mitre.org — http://www.mozilla.org/security/announce/2012/mfsa2012-58.html

OS impact

OS	Version	Status
ubuntu	10.04	affected
ubuntu	11.04	affected
ubuntu	11.10	affected
ubuntu	12.04	affected
suse	12.2	affected
suse	10	affected
suse	11	affected
rhel	5.0	affected
rhel	6.0	affected
rhel	6.3	affected

Application impact

Vendor	Product	Versions	Fixed
mozilla	firefox	`{"endExcluding":"15.0"}`	`15.0`
mozilla	seamonkey	`{"endExcluding":"2.12"}`	`2.12`
mozilla	thunderbird	`{"endExcluding":"15.0"}`	`15.0`
mozilla	thunderbird_esr	`{"startIncluding":"10.0","endExcluding":"10.0.7"}`	`10.0.7`

References

CWEs

CWE-787

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