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

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HIGH

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

Published Oct 13, 2013

10.0

HIGH

CVSS 2.0

EPSS 2.27%

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.

Affected products

Remediation

No remediation recorded yet.

Metrics

2.27% 0.02275

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.

EPSS probability 0.02275

Score over time

2022–2026

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Table of values (12 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 2, 2026	2.27% (0.02275)	82.49th	v5 (v2026.06.15)
Jun 15, 2026	1.65% (0.01652)	73.40th	v5 (v2026.06.15)
Mar 30, 2025	1.57% (0.01569)	79.82th	v4 (v2025.03.14)
Mar 29, 2025	2.80% (0.02799)	76.84th	v4 (v2025.03.14)
Mar 17, 2025	1.57% (0.01569)	80.25th	v4 (v2025.03.14)
Dec 12, 2024	0.41% (0.00410)	74.71th	v3 (v2023.03.01)
Feb 8, 2024	0.42% (0.00422)	73.56th	v3 (v2023.03.01)
Mar 7, 2023	0.42% (0.00422)	70.21th	v3 (v2023.03.01)
Mar 6, 2023	1.05% (0.01055)	52.13th	v2 (v2022.01.01)
Sep 17, 2022	1.05% (0.01055)	50.47th	v2 (v2022.01.01)
Apr 1, 2022	1.05% (0.01055)	48.43th	v2 (v2022.01.01)
Feb 4, 2022	1.05% (0.01055)	27.52th	v2 (v2022.01.01)

Weaknesses (1)

CWE-264

References (2)

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

Link	Providers	Tags
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20131009-asa		vendor-advisoryx_refsource_CISCOVendor Advisory
http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2013-5509		vendor-advisoryx_refsource_CISCOVendor Advisory

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner cisco

Published Oct 13, 2013

Updated Aug 6, 2024

Reserved Aug 22, 2013

Link CVE-2013-5509

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 16, 2026

Link CVE-2013-5509

Red Hat

Severity n/a

Public date n/a

Links CVE-2013-5509