Is CVE-2013-0764 in the CISA KEV catalog?

No. CVE-2013-0764 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2013-0764?

CVE-2013-0764 has a CVSS v2 base score of 9.3 (HIGH).

What is the EPSS score for CVE-2013-0764?

CVE-2013-0764 has an EPSS score of 3.15% (86th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2013-0764?

Upgrade DeveloperEdition to 19.0 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2013-0764

HIGHEPSS 86th pctl

9.3

CVSS v2

NVD

Description

The nsSOCKSSocketInfo::ConnectToProxy function in Mozilla Firefox before 18.0, Firefox ESR 17.x before 17.0.2, Thunderbird before 17.0.2, Thunderbird ESR 17.x before 17.0.2, and SeaMonkey before 2.15 does not ensure thread safety for SSL sessions, which allows remote attackers to execute arbitrary code via crafted data, as demonstrated by e-mail message data.

CWE-326

How to fix

Remediation Available

DeveloperEditionWindows application

Affected:19.0Fixed in:19.0Mozilla

Affected:17.0.3Fixed in:17.0.3Mozilla

Mozilla Firefox (en-US)Windows application

Affected:19.0Fixed in:19.0Mozilla

Affected:17.0.3Fixed in:17.0.3Mozilla

Mozilla Thunderbird (en-US)Windows application

Affected:17.0.3Fixed in:17.0.3Mozilla

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

3.15%probability of exploitation in 30 days

86thpercentile

Elevated risk: more likely to be exploited than 86% of all known CVEs.

References

Patch1

bugzilla.mozilla.org

Vendor Advisory1

mozilla.org

Third-Party Advisory8

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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.