CVE-2011-3656

6.1 mediumEPSS 0.8%

Medium (6.1) in mozilla firefox. EPSS 0.8% chance of exploitation in the next 30 days.

Cross-site scripting (XSS) vulnerability in Mozilla Firefox before 3.6.24 and 4.x through 7 allows remote attackers to inject arbitrary web script or HTML via vectors involving HTTP 0.9 errors, non-default ports, and content-sniffing.

Severity

CVSS 3.1

6.1 medium

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS: 0.8% chance of exploitation in the next 30 days; higher than 55% of CVEs (scores of 2026-10-31)
CWE: CWE-79
Published: 2021-06-02
Modified: 2026-06-16
Record from: the NVD, synced 2026-10-19

Affected

mozilla:firefox

References

https://bugzilla.mozilla.org/show_bug.cgi?id=667907
https://bugzilla.mozilla.org/show_bug.cgi?id=667907

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