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Cisco Bug: CSCus94026 - Cisco ASA ISAKMP Denial of Service Vulnerability

Last Modified

Jan 05, 2018

Products (1)

  • Cisco ASA 5500-X Series Firewalls

Known Affected Releases

100.13(0.31) 9.3(2.2)

Description (partial)

A vulnerability in the Internet Key Exchange (IKE) version 1 (v1) code of Cisco Adaptive Security Appliance (ASA) Software could allow an
unauthenticated, remote attacker to cause an affected system to reload.

The vulnerability is due to improper handling of Internet Security Association and Key Management Protocol (ISAKMP) packets. An attacker could
exploit this vulnerability by sending crafted UDP packets to the affected system. A successful exploit could allow the attacker to cause an
affected system to reload.

Note: Only traffic directed to the affected system can be used to exploit this vulnerability. This vulnerability affects systems configured in
routed firewall mode only and in single or multiple context mode. This vulnerability can be triggered by IPv4 and IPv6 traffic. 

Cisco has released software updates that address this vulnerability. Workarounds that mitigate this vulnerability are not available. This
advisory is available at the following link:

See Cisco Security Advisory
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