The HSRP implementation in Cisco NX-OS 6.2(2a) and earlier allows remote attackers to bypass authentication and cause a denial of service (group-member state modification and traffic blackholing) via malformed HSRP packets, aka Bug ID CSCup11309.
CVSS Severity (version 2.0):
Impact Subscore: 4.9
Exploitability Subscore: 6.5
CVSS Version 2 Metrics:
Access Vector: Local network exploitable
Access Complexity: Low
Authentication: Not required to exploit
Impact Type: Allows unauthorized modification; Allows disruption of service
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20140610 Cisco NX-OS Software HSRP Authentication Denial of Service Vulnerability