A vulnerability in authentication header packets processing on the Cisco ISM module for ISR G2 could allow an authenticated, remote attacker to cause a reload of the affected module. The vulnerability is due to improper processing of malformed authentication header packets. An attacker could exploit this vulnerability by sending a stream of malformed authentication header packets over an established IPsec security association. An exploit could allow the attacker to cause a reload of the affected module, resulting in a denial of service (DoS) condition for IPsec traffic. Cisco has confirmed the vulnerability in a security notice and software updates are available. To exploit this vulnerability, the attacker must authenticate to a targeted system to send malformed authentication header packets. This access requirement limits the possibility of a successful exploit. Customers are advised to review the bug reports in the "Vendor Announcements" section for a current list of affected versions. 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-May-07 |
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