Title: Cisco Discovery Protocol Neighbor Announcment Denial of Service Vulnerability
Severity: HIGH
Description:
Cisco Discovery Protocol (CDP) is a network neighbor discovery protocol distributed with implementations of the Cisco Internet Operating System.
A problem with CDP makes it possible for a user to deny service to legitimate users of network resources. This denial of service results due to a starvation of computing resources within the router.
CDP functions by sending traffic to all hosts on a segment of network via multicast. This traffic is answered by local neighbors. It can not be sent across routers to other networks, or across the Internet.
By generating large amounts of CDP traffic on a local network, it is possible to cause a Cisco router to react unpredictably, and potentially stop routing traffic. This could result in a denial of service.
Affected Products:
- Cisco IOS 11.1
- Cisco IOS 11.2
- Cisco IOS 11.3.11b
- Cisco IOS 12.0(5.1)XP
- Cisco IOS 12.0.19
- Cisco IOS 12.1
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