Cisco Security Advisory – Cisco IOS XR Software contains a vulnerability in the Border Gateway Protocol (BGP) feature. The vulnerability manifests itself when a BGP peer announces a prefix with a specific, valid but unrecognized transitive attribute. On receipt of this prefix, the Cisco IOS XR device will corrupt the attribute before sending it to the neighboring devices. Neighboring devices that receive this corrupted update may reset the BGP peering session.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/93253/cisco-sa-20100827-bgp.txt
Source: https://packetstormsecurity.com/files/93253/Cisco-Security-Advisory-20100827-bgp.html