How severe is CVE-2013-5509?

CVE-2013-5509 has a CVSS 2.0 base score of 10.0, rated critical severity.

Is CVE-2013-5509 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2013-5509?

CVE-2013-5509 primarily affects Cisco Adaptive Security Appliance Software. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2013-5509?

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-2013-5509 published?

CVE-2013-5509 was published on 2013-10-13 and last updated on 2026-06-16.

CVE-2013-5509

CVE-2013-5509 is a critical-severity vulnerability in Cisco Adaptive Security Appliance Software 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-264.

Key facts

Severity: Critical (CVSS 2.0 base score 10.0)
EPSS exploit prediction: 2% (74th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-264
Affected product: Cisco Adaptive Security Appliance Software
Published: 2013-10-13
Last modified: 2026-06-16

Description

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.

Frequently asked questions

What is CVE-2013-5509?: 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.
How severe is CVE-2013-5509?: CVE-2013-5509 has a CVSS 2.0 base score of 10.0, rated critical severity.
Is CVE-2013-5509 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2013-5509?: CVE-2013-5509 primarily affects Cisco Adaptive Security Appliance Software. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2013-5509?: 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-2013-5509 published?: CVE-2013-5509 was published on 2013-10-13 and last updated on 2026-06-16.

References

Affected products (2)

cpe:2.3:o:cisco:adaptive_security_appliance_software:9.0:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.1:*:*:*:*:*:*:*

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