The design of the Hot Standby Routing Protocol (HSRP), as implemented on Cisco IOS 12.1, when using IRPAS, allows remote attackers to cause a denial of service (CPU consumption) via a router with the same IP address as the interface on which HSRP is running, which causes a loop.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Ios | Cisco | 12.1 (including) | 12.1 (including) |