Cisco ASA 5500 Series Adaptive Security Appliance firmware contains a vulnerability that could allow an unauthenticated, remote attacker to access sensitive information on a targeted system.
The vulnerability is due to improper proxy authentication during attempts to cut through a targeted system. An unauthenticated, remote attacker could exploit this vulnerability to access sensitive information by tricking a user into authenticating to the system. If successful, the attacker could use this information to launch further attacks.
Cisco has confirmed this vulnerability and released software updates.
To exploit this vulnerability, an attacker would need to access trusted, internal networks. This access requirement decreases the likelihood of a successful exploit.
Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.