CVE-2006-1928
Cisco IOS XR, when configured for Multi Protocol Label Switching (MPLS) and running on Cisco CRS-1 routers, allows remote attackers to cause a denial of service (Modular Services Cards (MSC) crash or "MPLS packet handling problems") via certain MPLS packets, as identified by Cisco bug IDs (1) CSCsd15970 and (2) CSCsd55531.
Date published : 2006-04-20
http://www.securityfocus.com/bid/17607
http://www.cisco.com/warp/public/707/cisco-sa-20060419-xr.shtml