CVE-2012-3964: n/a vulnerability

CVE-2012-3964: Use-after-free vulnerability in the gfxTextRun::GetUserData function in Mozilla Firefox before 15.0, Firefo...

Use-after-free vulnerability in the gfxTextRun::GetUserData 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 or cause a denial of service (heap memory corruption) via unspecified vectors.

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

Security readout for executives and security teams

CVE-2012-3964 is an old Mozilla memory-safety flaw that could let a malicious remote input crash affected browsers or mail clients, or potentially run code. The main business risk is legacy systems still running Firefox, Thunderbird, or SeaMonkey versions from before the 2012 security releases. Exposure is most likely on unmanaged endpoints, embedded appliances, or legacy Linux images retaining obsolete Mozilla packages. Modern supported Mozilla releases should not be affected by this specific fixed 2012 issue. Treat this as high priority only where legacy Mozilla software remains in use. It is not a new threat signal, but affected versions are far beyond support and represent unacceptable workstation or appliance risk. Mitigation focus: Upgrade Firefox to 15.0 or later, or Firefox ESR to 10.0.7 or later.; Upgrade Thunderbird to 15.0 or later, or Thunderbird ESR to 10.0.7 or later.; Upgrade SeaMonkey to 2.12 or later if present..

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

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

description · low confidence lookup

Execution behavior lookup

The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup

cve · low confidence lookup

CVE-2012-3964 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup

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

3Source 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
oval:org.mitre.oval:def:16857CVE reference · vdb-entry, signature
https://bugzilla.mozilla.org/show_bug.cgi?id=756241CVE reference · x_refsource_CONFIRM

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.