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.

How do I fix CVE-2011-3659?

Upgrade DeveloperEdition to 10.0 or later. Fixes are available for 3 affected products.

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

How to fix

Remediation Available

DeveloperEditionWindows application

Affected:4.0 10.0Fixed in:10.0Mozilla

Affected:3.6.26Fixed in:3.6.26Mozilla

Mozilla Firefox (en-US)Windows application

Affected:4.0 10.0Fixed in:10.0Mozilla

Affected:3.6.26Fixed in:3.6.26Mozilla

Mozilla Thunderbird (en-US)Windows application

Affected:3.1.18Fixed in:3.1.18Mozilla

Affected:5.0 10.0Fixed in:10.0Mozilla

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

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

Patch1

bugzilla.mozilla.org

Vendor Advisory1

mozilla.org

Third-Party Advisory5

Related Vulnerabilities

Other CWE-416 (Use After Free) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-0708	Critical	9.8	100%	KEV + Ransom	-
CVE-2021-31166	Critical	9.8	100%	KEV	Fix
CVE-2015-5119	Critical	9.8	99%	KEV	-
CVE-2010-3962	High	8.1	97%	KEV	-
CVE-2015-0313	Critical	9.8	96%	KEV	Fix
CVE-2017-9798	High	7.5	95%	-	Fix

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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.