Is CVE-2011-3659 in the CISA KEV catalog?

No. CVE-2011-3659 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2011-3659?

CVE-2011-3659 has a CVSS v2 base score of 9.3 (HIGH).

What is the EPSS score for CVE-2011-3659?

CVE-2011-3659 has an EPSS score of 36.51% (98th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2011-3659

HIGHEPSS 98th pctl

9.3

CVSS v2

NVD

Description

Use-after-free vulnerability in Mozilla Firefox before 3.6.26 and 4.x through 9.0, Thunderbird before 3.1.18 and 5.0 through 9.0, and SeaMonkey before 2.7 might allow remote attackers to execute arbitrary code via vectors related to incorrect AttributeChildRemoved notifications that affect access to removed nsDOMAttribute child nodes.

CWE-416Use After Free

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

36.51%probability of exploitation in 30 days

98thpercentile

Very high risk: more likely to be exploited than 98% of all known CVEs.

References

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-29.