CVE-2012-5840: n/a vulnerability

CVE-2012-5840: Use-after-free vulnerability in the nsTextEditorState::PrepareEditor function in Mozilla Firefox before 17....

Use-after-free vulnerability in the nsTextEditorState::PrepareEditor function in Mozilla Firefox before 17.0, Firefox ESR 10.x before 10.0.11, Thunderbird before 17.0, Thunderbird ESR 10.x before 10.0.11, and SeaMonkey before 2.14 allows remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption) via unspecified vectors, a different vulnerability than CVE-2012-4214.

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

Security readout for executives and security teams

This is a memory-safety flaw in older Mozilla browser and mail products. A remote attacker could potentially crash the application or run code through unspecified vectors. The practical urgency is highest for organizations still running legacy Firefox, Thunderbird, SeaMonkey, or downstream Linux packages from the affected era. Exposure is most likely in unmanaged legacy desktops, embedded systems, old virtual images, or Linux distributions retaining vulnerable Mozilla packages. Current supported Mozilla releases should not be assumed affected from these sources. Treat this as high priority only where legacy Mozilla products remain in service. For modern managed fleets, priority is mainly confirmation and cleanup of obsolete software. Mitigation focus: Upgrade Firefox to 17.0 or later, or ESR 10.0.11 or later.; Upgrade Thunderbird to 17.0 or later, or ESR 10.0.11 or later.; Upgrade SeaMonkey to 2.14 or later..

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

Conservative CVE-to-ATT&CK context

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Execution behavior lookup

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cve · low confidence lookup

CVE-2012-5840 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

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
oval:org.mitre.oval:def:16904CVE reference · vdb-entry, signature
mozilla-prepareeditor-code-exec(80190)CVE reference · vdb-entry, x_refsource_XF
https://bugzilla.mozilla.org/show_bug.cgi?id=805287CVE 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.