CVE-2012-4207

medium

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

4.3

Description

The HZ-GB-2312 character-set implementation in Mozilla Firefox before 17.0, Firefox ESR 10.x before 10.0.11, Thunderbird before 17.0, Thunderbird ESR 10.x before 10.0.11, and SeaMonkey before 2.14 does not properly handle a ~ (tilde) character in proximity to a chunk delimiter, which allows remote attackers to conduct cross-site scripting (XSS) attacks via a crafted document.

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

Debian Affected 2 releases

Version	Status	Fixed in
7.0	Affected	—
6.0	Affected	—

Red Hat Affected 3 releases

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

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`
mozilla	thunderbird_esr	`{"startIncluding":"10.0","endExcluding":"10.0.11"}`	`10.0.11`

References

CWEs

CWE-79

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

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