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Cisco Bug: CSCvq04931 - Cisco Web Security Appliance HTTP Header Injection Vulnerability

Last Modified

May 05, 2020

Products (1)

  • Cisco Web Security Appliance

Known Affected Releases


Description (partial)

A vulnerability in the API Framework of Cisco AsyncOS for Cisco Web Security Appliance (WSA) and for Cisco Content Security Management Appliance (SMA) could allow an unauthenticated, remote attacker to inject crafted HTTP Headers in the web server''''s response.
The vulnerability is due to insufficient validation of user input. An attacker could exploit this vulnerability by persuading a user to access a crafted URL and receive a malicious HTTP response. A successful exploit could allow the attacker to inject arbitrary HTTP Headers into valid HTTP responses sent to a user''''s browser.

There are no workarounds that address this vulnerability.
This advisory is available at the following link:

Please refer to the Security Advisory.
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