CVE-2012-4218: n/a vulnerability

CVE-2012-4218: Use-after-free vulnerability in the BuildTextRunsScanner::BreakSink::SetBreaks function in Mozilla Firefox...

Use-after-free vulnerability in the BuildTextRunsScanner::BreakSink::SetBreaks function in Mozilla Firefox before 17.0, Thunderbird before 17.0, and SeaMonkey before 2.14 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, 20:28 UTC (UTC+00:00)

Security readout for executives and security teams

Old Mozilla browser and mail clients could mishandle memory while processing content, potentially letting a remote attacker crash the application or run code. The source bundle identifies affected Firefox, Thunderbird, and SeaMonkey versions, but does not provide CVSS scoring or detailed trigger conditions. Exposure is most likely limited to legacy systems still running Firefox before 17.0, Thunderbird before 17.0, SeaMonkey before 2.14, or older distro packages covered by Ubuntu and openSUSE advisories. Treat as high priority only where legacy Mozilla software remains. Modern environments are unlikely to be exposed, but old browser or mail clients create code-execution risk from remote content. Mitigation focus: Upgrade Firefox, Thunderbird, and SeaMonkey to versions beyond the affected releases.; Apply relevant Ubuntu or openSUSE security updates where distro packages are used.; Remove unsupported legacy Mozilla applications 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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Execution behavior lookup

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CVE-2012-4218 mapping review

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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

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=767765CVE reference · x_refsource_CONFIRM
oval:org.mitre.oval:def:16885CVE 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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