Executive Summary

Title Cisco Adaptive Security Appliance Virtual Private Network SSL Client Certificate Bypass Vulnerability
Name cisco-sa-20180418-asa1 First vendor Publication 2018-04-18
Vendor Cisco Last vendor Modification 2018-04-18
Severity (Vendor) N/A Revision N/A

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score NA
Base Score NA Environmental Score NA
impact SubScore NA Temporal Score NA
Exploitabality Sub Score NA
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:L/Au:N/C:N/I:P/A:N)
Cvss Base Score 5 Attack Range Network
Cvss Impact Score 2.9 Attack Complexity Low
Cvss Expoit Score 10 Authentication None Required
Calculate full CVSS 2.0 Vectors scores


A vulnerability in the Secure Sockets Layer (SSL) Virtual Private Network (VPN) Client Certificate Authentication feature for Cisco Adaptive Security Appliance (ASA) could allow an unauthenticated, remote attacker to establish an SSL VPN connection and bypass certain SSL certificate verification steps.

The vulnerability is due to incorrect verification of the SSL Client Certificate. An attacker could exploit this vulnerability by connecting to the ASA VPN without a proper private key and certificate pair. A successful exploit could allow the attacker to establish an SSL VPN connection to the ASA when the connection should have been rejected.

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

This advisory is available at the following link:

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-asa1 ["https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-asa1"]


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Original Source

Url : http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco (...)

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-295 Certificate Issues

CPE : Common Platform Enumeration

Application 503
Application 18
Os 29
Os 1

Nessus® Vulnerability Scanner

Date Description
2018-04-27 Name : The remote device is missing a vendor-supplied security patch.
File : cisco-sa-20180418-asa1.nasl - Type : ACT_GATHER_INFO

Alert History

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Date Informations
2018-05-22 21:21:33
  • Multiple Updates
2018-04-20 00:21:17
  • Multiple Updates
2018-04-18 21:18:27
  • First insertion