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

Security Impact Rating: High

CVE: CVE-2017-12246

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