VAR-200110-0021

Vulnerability from variot - Updated: 2025-04-03 22:37

Cisco Hot Standby Routing Protocol (HSRP) allows local attackers to cause a denial of service by spoofing HSRP packets. A denial-of-service vulnerability exists in the Hot Standby Router Protocol (HSRP) . It is designed to offer traffic rerouting services to networks when one router within a pool ceases to operate, and users of the network segment aren't using ICMP Router Discovery Protocol to find the new router handling traffic for their segment. By eavesdropping on HSRP management messages sent over the network, it is possible to create a spoofed message that will reroute all network traffic to a particular system. By doing so, it is possible to prevent traffic from entering or leaving that network. This problem makes it possible for system local to the network to deny service to legitmate users of that network segment

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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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