CVE-2012-4207: n/a vulnerability

CVE-2012-4207: The HZ-GB-2312 character-set implementation in Mozilla Firefox before 17.0, Firefox ESR 10.x before 10.0.11...

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.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 6, 2024, 20:28 UTC (UTC+00:00)

Security readout for executives and security teams

This older Mozilla vulnerability let a malicious document abuse character-set parsing to run cross-site scripting in affected Firefox, Thunderbird, and SeaMonkey versions. Business urgency depends on whether legacy Mozilla clients still exist. Modern, supported versions should not be affected by the fixed-version ranges in the CVE description. Exposure is most likely in legacy desktops, old Linux distributions, archived virtual machines, or embedded environments still running the named pre-fix Mozilla products. Current supported Mozilla products are unlikely to be exposed based on the fixed versions listed. Treat this as a legacy exposure cleanup item, not an emergency, unless affected versions are still deployed. Prioritize confirmation through asset inventory and endpoint management, then remove or update obsolete Mozilla clients. Mitigation focus: Upgrade Firefox, Thunderbird, and SeaMonkey beyond the fixed versions named in the CVE.; Apply relevant distribution security updates from Ubuntu, Debian, Red Hat, or SUSE.; Remove unsupported legacy Mozilla clients from managed endpoints..

Prepared: Jun 24, 2026, 12:04 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Nov 21, 2012, 11:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

4Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
firefox-hzgb2312-xss(80179)CVE reference · vdb-entry, x_refsource_XF
https://bugzilla.mozilla.org/show_bug.cgi?id=801681CVE reference · x_refsource_CONFIRM
oval:org.mitre.oval:def:16955CVE reference · vdb-entry, signature

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

No CWE listed

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