Cisco Security Advisory: Cisco IOS XR MPLS Vulnerabilities – ultiple Multi Protocol Label Switching (MPLS) related vulnerabilities exist on Cisco IOS XR. Only systems that are running Cisco IOS XR and configured for MPLS are affected by these vulnerabilities.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/45782/cisco-sa-20060419-xr.txt
Source: https://packetstormsecurity.com/files/45782/Cisco-Security-Advisory-20060419-xr.html