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CVE-2013-6167: Mozilla Firefox through 27 sends HTTP Cookie headers without first validating that they have the required c...

Mozilla Firefox through 27 sends HTTP Cookie headers without first validating that they have the required character-set restrictions, which allows remote attackers to conduct the equivalent of a persistent Logout CSRF attack via a crafted parameter that forces a web application to set a malformed cookie within an HTTP response.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysis

Security readout for executives and security teams

Firefox through version 27 could send malformed cookie headers instead of rejecting them first. An attacker could abuse a vulnerable web application path to set a bad cookie that repeatedly logs a user out. The known impact is session disruption, not code execution or confirmed data theft. Exposure is most plausible where users still operate Firefox 27 or earlier, or where legacy embedded browser stacks inherit similar behavior. Applications that allow untrusted input into cookie-setting responses may increase practical exposure. Treat this as a legacy-browser hygiene and session-reliability issue. It deserves prompt remediation where old Firefox remains in use, but the source bundle does not support emergency prioritization for modern environments. Mitigation focus: Retire or update Firefox 27 and earlier where still present.; Check Mozilla Bugzilla 858215 and vendor guidance for fixed-version details.; Validate and constrain application inputs used in Set-Cookie responses..

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Unknown
CVSS
Not scored
Known Exploited
No
Published
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CNA and ADP enrichment extracted from CVE v5

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