A vulnerability in the DNS code of Cisco ASA Software could allow an unauthenticated, remote attacker to cause the reload of an affected system. The vulnerability is due to improper handling of DNS error cases when the Cisco ASA Software receives a DNS reply packet under a particular system configuration. An attacker could exploit this vulnerability by either owning a DNS server or ensuring that the reply to a DNS request from an affected system is malformed. An exploit could allow the attacker to cause the reload of the affected system. Cisco has confirmed the vulnerability in a security notice and released software updates. Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
| Version | Description | Section | Status | Date |
| 1.0 | Initial Release | NA | Final | 2013-Dec-02 |
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