CVE-2012-3995: n/a vulnerability

CVE-2012-3995: The IsCSSWordSpacingSpace function in Mozilla Firefox before 16.0, Firefox ESR 10.x before 10.0.8, Thunderb...

The IsCSSWordSpacingSpace function in Mozilla Firefox before 16.0, Firefox ESR 10.x before 10.0.8, Thunderbird before 16.0, Thunderbird ESR 10.x before 10.0.8, and SeaMonkey before 2.13 allows remote attackers to execute arbitrary code or cause a denial of service (out-of-bounds read) via unspecified vectors.

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

Security readout for executives and security teams

CVE-2012-3995 is a Mozilla browser and mail-client memory-safety issue. A remote attacker could cause code execution or a crash in affected Firefox, Thunderbird, and SeaMonkey versions. Business urgency depends on whether any legacy Mozilla clients remain in use, especially on endpoints that browse untrusted content or open email. Exposure is most likely on obsolete desktops, managed images, thin clients, kiosks, or servers still running 2012-era Mozilla packages. Modern supported Mozilla releases should not be considered affected based on the provided version ranges. Treat this as a legacy exposure cleanup item with high impact if present. It should not distract from active-exploitation priorities unless inventory finds affected Mozilla clients still deployed. Mitigation focus: Upgrade Firefox to 16.0 or later, or ESR 10.0.8 or later.; Upgrade Thunderbird to 16.0 or later, or ESR 10.0.8 or later.; Upgrade SeaMonkey to 2.13 or later where present..

Prepared: Jun 27, 2026, 16:25 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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ATT&CK lookup starting points

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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.

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cve · low confidence lookup

CVE-2012-3995 mapping review

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Oct 10, 2012, 17:00 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
https://bugzilla.mozilla.org/show_bug.cgi?id=765621CVE reference · x_refsource_CONFIRM
oval:org.mitre.oval:def:16808CVE reference · vdb-entry, signature
firefox-iscsswordspacingspace-code-exec(79156)CVE reference · vdb-entry, x_refsource_XF

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.