CVE-2012-4218

critical

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

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CVSS v3

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CVSS v4 NEW

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not yet in upstream

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

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

OS impact

SUSE Affected 5 releases

Version	Status	Fixed in
12.2	Affected	—
12.1	Affected	—
11.4	Affected	—
11	Affected	—
10	Affected	—

Ubuntu Affected 4 releases

Version	Status	Fixed in
12.10	Affected	—
12.04	Affected	—
11.10	Affected	—
10.04	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

Community-verified mitigations for this CVE will appear above when contributors publish them.

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