CVE-2012-3957

critical

Published 2012-08-29 · 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

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

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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

Red Hat Affected 3 releases

Version	Status	Fixed in
6.3	Affected	—
6.0	Affected	—
5.0	Affected	—

SUSE Affected 3 releases

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

Ubuntu Affected 4 releases

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

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

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