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Re: Three possible DoS attacks against some IOS versions.
From: Felix Lindner <felix.lindner () nruns com>
Date: Sat, 08 Jun 2002 11:21:40 +0200

Sharad Ahlawat wrote:
an excerpt form RFC 2281 - Cisco HSRP

7. Security Considerations
 It is difficult to subvert the protocol from outside the
 LAN as most routers will not forward packets addressed to the
 all-routers multicast address (

This does not prevent remote attacks because Cisco devices do not
validate the destination address of a HSRP packet. Unicast packets are
accepted, which can be tested using the hrsp tool at


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