CVE-2012-3956: n/a vulnerability

CVE-2012-3956: Use-after-free vulnerability in the MediaStreamGraphThreadRunnable::Run function in Mozilla Firefox before...

Use-after-free vulnerability in the MediaStreamGraphThreadRunnable::Run 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

This is an old Mozilla client memory-corruption flaw. A remote attacker could potentially crash the application or run code if a user reached malicious content through an affected Firefox, Thunderbird, or SeaMonkey version. It matters mainly for legacy systems still running 2012-era Mozilla software. Exposure is most likely on unmanaged legacy endpoints, old VDI images, or systems using frozen Linux packages with affected Mozilla clients. Modern supported versions should not be exposed to this specific issue if vendor updates were applied. Prioritize remediation where legacy browsers or mail clients still process internet or email content. For fully updated modern fleets, this CVE is mainly a legacy hygiene and asset discovery issue. Mitigation focus: Upgrade affected Mozilla products to the fixed versions or later.; Apply Red Hat, Ubuntu, or SUSE security updates where those packages are vendor-managed.; Remove or replace unsupported legacy Firefox, Thunderbird, and SeaMonkey installations..

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

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Execution behavior lookup

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CVE-2012-3956 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

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
https://bugzilla.mozilla.org/show_bug.cgi?id=774597CVE reference · x_refsource_CONFIRM
oval:org.mitre.oval:def:16997CVE 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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