A vulnerability in the DHCPv6 server module of Cisco Network Registrar could allow an unauthenticated, remote attacker to cause a reload of the DHCPv6 server on an affected device. The vulnerability is due to the way certain malformed requests are processed. An attacker could exploit this vulnerability by sending a malformed DHCPv6 packet to an affected device. A successful exploit could allow the attacker to cause a reload of the DHCPv6 server, which could result in a denial of service condition. Cisco has confirmed the vulnerability in a security notice and released software updates. To exploit this vulnerability, an attacker may need access to trusted, internal networks to send malformed DHCPv6 packets to a targeted device. This access requirement decreases the possibility 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.
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 | 2014-Apr-18 |
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