CVE-2012-4218

critical

Published 2012-11-21 · Modified 2026-04-29

CVSS v3

—

CVSS v2

10.0

VIR risk

10.0

Description

Use-after-free vulnerability in the BuildTextRunsScanner::BreakSink::SetBreaks function in Mozilla Firefox before 17.0, Thunderbird before 17.0, and SeaMonkey before 2.14 allows remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption) 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=767765

vendor Authored 2026-05-27

Vendor advisory: cve@mitre.org — http://www.mozilla.org/security/announce/2012/mfsa2012-105.html

OS impact

OS	Version	Status
ubuntu	10.04	affected
ubuntu	11.10	affected
ubuntu	12.04	affected
ubuntu	12.10	affected
suse	11.4	affected
suse	12.1	affected
suse	12.2	affected
suse	10	affected
suse	11	affected

Application impact

Vendor	Product	Versions	Fixed
mozilla	firefox	`{"endExcluding":"17.0"}`	`17.0`
mozilla	seamonkey	`{"endExcluding":"2.14"}`	`2.14`
mozilla	thunderbird	`{"endExcluding":"17.0"}`	`17.0`

References

CWEs

CWE-416

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