CVE-2011-2363

CVE-2011-2363 is a critical-severity vulnerability in Mozilla Seamonkey with a CVSS 2.0 base score of 10.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-399.

Key facts

• Severity: Critical (CVSS 2.0 base score 10.0)
• EPSS exploit prediction: 6% (92nd percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-399
• Affected product: Mozilla Seamonkey
• Published: 2011-06-30
• Last modified: 2026-06-16

Description

Use-after-free vulnerability in the nsSVGPointList::AppendElement function in the implementation of SVG element lists in Mozilla Firefox before 3.6.18, Thunderbird before 3.1.11, and SeaMonkey through 2.0.14 allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via vectors involving a user-supplied callback.

Frequently asked questions

What is CVE-2011-2363?

Use-after-free vulnerability in the nsSVGPointList::AppendElement function in the implementation of SVG element lists in Mozilla Firefox before 3.6.18, Thunderbird before 3.1.11, and SeaMonkey through 2.0.14 allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via vectors involving a user-supplied callback.

How severe is CVE-2011-2363?

CVE-2011-2363 has a CVSS 2.0 base score of 10.0, rated critical severity.

Is CVE-2011-2363 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-2363?

CVE-2011-2363 primarily affects Mozilla Seamonkey. In total, 251 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-2363?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2011-2363 published?

CVE-2011-2363 was published on 2011-06-30 and last updated on 2026-06-16.

References

• http://lists.opensuse.org/opensuse-security-announce/2011-07/msg00001.html
• http://secunia.com/advisories/45002
• http://support.avaya.com/css/P8/documents/100144854
• http://support.avaya.com/css/P8/documents/100145333
• http://www.debian.org/security/2011/dsa-2268
• http://www.debian.org/security/2011/dsa-2269
• http://www.debian.org/security/2011/dsa-2273
• http://www.mandriva.com/security/advisories?name=MDVSA-2011:111
• http://www.mozilla.org/security/announce/2011/mfsa2011-23.html
• http://www.redhat.com/support/errata/RHSA-2011-0885.html
• http://www.redhat.com/support/errata/RHSA-2011-0886.html
• http://www.redhat.com/support/errata/RHSA-2011-0887.html
• http://www.redhat.com/support/errata/RHSA-2011-0888.html
• http://www.ubuntu.com/usn/USN-1149-1
• https://bugzilla.mozilla.org/show_bug.cgi?id=648160
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A14046

Affected products (251)

• cpe:2.3:a:mozilla:seamonkey:1.0:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.0:alpha:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.0:beta:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.0.2:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.0.3:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.0.4:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.0.5:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.0.6:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.0.7:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.0.8:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.0.9:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.1:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.1:alpha:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.1:beta:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.1.1:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.1.2:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.1.3:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.1.4:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.1.5:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.1.6:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.1.7:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.1.8:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.1.9:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.1.10:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.1.11:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.1.12:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.1.13:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.1.14:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.1.15:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.1.16:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.1.17:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.1.18:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.1.19:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.5.0.8:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.5.0.9:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:1.5.0.10:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:2.0:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:2.0:alpha_1:*:*:*:*:*:*
• cpe:2.3:a:mozilla:seamonkey:2.0:alpha_2:*:*:*:*:*:*

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