CVE-2012-0475: n/a vulnerability

CVE-2012-0475: Mozilla Firefox 4.x through 11.0, Thunderbird 5.0 through 11.0, and SeaMonkey before 2.9 do not properly co...

Mozilla Firefox 4.x through 11.0, Thunderbird 5.0 through 11.0, and SeaMonkey before 2.9 do not properly construct the Origin and Sec-WebSocket-Origin HTTP headers, which might allow remote attackers to bypass an IPv6 literal ACL via a cross-site (1) XMLHttpRequest or (2) WebSocket operation involving a nonstandard port number and an IPv6 address that contains certain zero fields.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 6, 2024, 18:23 UTC (UTC+00:00)

Security readout for executives and security teams

This is an old Mozilla client-side issue where certain Firefox, Thunderbird, and SeaMonkey versions could format origin headers incorrectly. In a specific IPv6 literal and nonstandard-port scenario, a remote site might bypass an access control decision that trusted those headers. Exposure is mainly legacy desktops, kiosks, VDI images, or embedded workflows still using the affected Mozilla versions. Modern supported browsers and mail clients are unlikely to be exposed based on the listed version ranges. Treat this as a legacy hygiene item unless affected products are still present. Priority rises if internal services depend on browser origin headers for access control to IPv6 literal addresses. Mitigation focus: Upgrade affected Mozilla products beyond the listed vulnerable version ranges.; Retire unsupported Firefox, Thunderbird, and SeaMonkey installations from managed environments.; Check Mozilla MFSA2012-28 and vendor guidance for confirmed fixed versions..

Prepared: Jun 24, 2026, 12:52 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

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Apr 25, 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

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
firefox-websocket-sec-bypass(75153)CVE reference · vdb-entry, x_refsource_XF
oval:org.mitre.oval:def:16279CVE reference · vdb-entry, signature
https://bugzilla.mozilla.org/show_bug.cgi?id=694576CVE 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

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