Executive Summary

Title Cisco Adaptive Security Appliance Software Direct Authentication Denial of Service Vulnerability
Name cisco-sa-20171004-asa First vendor Publication 2017-10-04
Vendor Cisco Last vendor Modification 2017-10-04
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:N/A:C)
Cvss Base Score 7.8 Attack Range Network
Cvss Impact Score 6.9 Attack Complexity Low
Cvss Expoit Score 10 Authentication None Required
Calculate full CVSS 2.0 Vectors scores


A vulnerability in the implementation of the direct authentication feature in Cisco Adaptive Security Appliance (ASA) Software could allow an unauthenticated, remote attacker to cause an affected device to unexpectedly reload, resulting in a denial of service (DoS) condition.

The vulnerability is due to incomplete input validation of the HTTP header. An attacker could exploit this vulnerability by sending a crafted HTTP request to the local IP address of an affected device. A successful exploit could allow the attacker to cause the affected device to reload.

Note: Only traffic directed to the affected system can be used to exploit this vulnerability. This vulnerability affects systems that have the direct authentication feature enabled. This vulnerability can be triggered by IPv4 or IPv6 traffic.

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-20171004-asa ["https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171004-asa"]


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Original Source

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

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-20 Improper Input Validation

CPE : Common Platform Enumeration

Application 3

Snort® IPS/IDS

Date Description
2017-10-05 Cisco Adaptive Security Appliance direct authentication denial of service att...
RuleID : 44503 - Revision : 1 - Type : SERVER-WEBAPP

Nessus® Vulnerability Scanner

Date Description
2017-10-12 Name : The remote device is missing a vendor-supplied security patch.
File : cisco-sa-20171004-asa-adaptive_security_appliance.nasl - Type : ACT_GATHER_INFO

Alert History

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Date Informations
2017-11-01 17:22:39
  • Multiple Updates
2017-10-13 13:25:48
  • Multiple Updates
2017-10-05 13:26:50
  • Multiple Updates
2017-10-04 21:22:27
  • First insertion