CVE-2012-3966: n/a vulnerability

CVE-2012-3966: Mozilla Firefox before 15.0, Firefox ESR 10.x before 10.0.7, Thunderbird before 15.0, Thunderbird ESR 10.x...

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 allow remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a negative height value in a BMP image within a .ICO file, related to (1) improper handling of the transparency bitmask by the nsICODecoder component and (2) improper processing of the alpha channel by the nsBMPDecoder component.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 6, 2024, 20:21 UTC (UTC+00:00)

Security readout for executives and security teams

This is a legacy Mozilla image-parsing flaw. A malicious .ICO file containing a crafted BMP image could crash affected software or potentially run attacker-controlled code. Business risk is mainly in old Firefox, Thunderbird, SeaMonkey, and ESR deployments that have not been patched since 2012. Exposure is most likely on unsupported legacy desktops, embedded systems, kiosks, or servers retaining old Mozilla browser or mail packages. Modern supported versions should not be affected if they are updated beyond the fixed releases named in Mozilla and vendor advisories. Prioritize remediation where legacy Mozilla software still exists, especially on systems that process web or email content. For fully modernized fleets, this is mainly a historical hygiene and asset-discovery issue rather than an urgent active-exploitation event. Mitigation focus: Upgrade Firefox to 15.0 or later and Firefox ESR to 10.0.7 or later.; Upgrade Thunderbird to 15.0 or later and Thunderbird ESR to 10.0.7 or later.; Upgrade SeaMonkey to 2.12 or later..

Prepared: Jun 28, 2026, 00:52 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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CVE-2012-3966 mapping review

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Aug 29, 2012, 10:00 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
https://bugzilla.mozilla.org/show_bug.cgi?id=775794CVE reference · x_refsource_CONFIRM
https://bugzilla.mozilla.org/show_bug.cgi?id=775793CVE reference · x_refsource_CONFIRM
oval:org.mitre.oval:def:16246CVE 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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