Executive Summary

Title Cisco Web Security Appliance HTTP Length Denial of Service Vulnerability
Name cisco-sa-20160518-wsa3 First vendor Publication 2016-05-18
Vendor Cisco Last vendor Modification 2016-05-18
Severity (Vendor) N/A Revision 1.0

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 HTTP request parsing in Cisco AsyncOS for the Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition when the proxy process unexpectedly restarts.

The vulnerability occurs because the affected software does not properly allocate space for the HTTP header and any expected HTTP payload. An attacker could exploit this vulnerability by sending a crafted HTTP request to the affected device. An exploit could allow the attacker to cause a DoS condition when the proxy process unexpectedly reloads, which can cause traffic to be dropped.

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:


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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 27

Nessus® Vulnerability Scanner

Date Description
2016-05-26 Name : The remote security appliance is missing a vendor-supplied patch.
File : cisco-sa-20160518-wsa1_to_wsa4.nasl - Type : ACT_GATHER_INFO

Alert History

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Date Informations
2016-05-27 13:27:33
  • Multiple Updates
2016-05-26 00:34:35
  • Multiple Updates
2016-05-18 21:24:18
  • First insertion