Is CVE-2013-5509 being actively exploited?

CVE-2013-5509 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2013-5509?

CVE-2013-5509 has a CVSS 2.0 base score of 10.0 (HIGH).

CVE-2013-5509

HIGH · CVSS 10.0EPSS 2.3%EU EUVD

The SSL implementation in Cisco Adaptive Security Appliance (ASA) Software 9.0 before 9.0(2.6) and 9.1 before 9.1(2) allows remote attackers to bypass authentication, and obtain VPN access or administrative access, via a crafted X.509 client certificate, aka Bug ID CSCuf52468.

Key facts

CVSS score: 10.0 (v2.0)
Severity: HIGH
CVSS vector: AV:N/AC:L/Au:N/C:C/I:C/A:C
Weakness (CWE): CWE-264
EPSS score: 2.3% (83th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2013-5349)
Published: October 13, 2013
NVD last modified: June 16, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2013-5349 in the EU Vulnerability Database. Last updated in EUVD on August 6, 2024.

View on the EU Vulnerability Database

Affected products

cisco / adaptive security appliance software
cisco / adaptive security appliance software

Certified products that may be affected

1 FIPS 140 or Common Criteria certified product, from automated matching by sec-certs.org.

Cisco Adaptive Security Appliances Version: ASA software version 9.1(2) Components: ASA 5500 (5505, 5510, 5520, 5540, 5550, 5580-20-40), ASA 5500-X Series (5512-X, 5515-X, 5525-X, 5545-X, 5555-X), ASA 5585-X (5585-10, 5585-20, 5585-40, 5585-60), ASA Services Module (ASA-SM) - Cisco Systems, Inc. - Common Criteria Certificate Number: 2013/86 - archived

References

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20131009-asa(Vendor Advisory)
http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2013-5509(Vendor Advisory)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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