CVE-2012-3957: n/a vulnerability

CVE-2012-3957: Heap-based buffer overflow in the nsBlockFrame::MarkLineDirty function in Mozilla Firefox before 15.0, Fire...

Heap-based buffer overflow in the nsBlockFrame::MarkLineDirty 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 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-side memory corruption issue. A vulnerable Firefox, Thunderbird, or SeaMonkey installation could be made to run attacker-controlled code through unspecified remote content. Business urgency depends on whether any legacy endpoints still run the affected versions. Exposure is most likely on unmanaged or legacy desktops, servers, kiosks, or embedded workflows still running the affected Mozilla versions or old distribution packages. Current supported Mozilla releases should not be assumed exposed from these sources. Prioritize remediation if any legacy Mozilla clients remain in production. The issue enables remote code execution, but the evidence bundle does not show current exploitation or modern product exposure. Mitigation focus: Upgrade Firefox, Thunderbird, and SeaMonkey to the fixed versions or later.; Apply relevant Red Hat, Ubuntu, or SUSE security updates where Mozilla is OS-packaged.; Remove or isolate unsupported legacy systems that cannot receive browser or mail-client updates..

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-2012-3957 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=774548CVE reference · x_refsource_CONFIRM
oval:org.mitre.oval:def:16940CVE 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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