[原文]Cisco IOS XR, when configured for Multi Protocol Label Switching (MPLS) and running on Cisco CRS-1 or Cisco 12000 series routers, allows remote attackers to cause a denial of service (Line card crash) via certain MPLS packets, as identified by Cisco bug ID CSCsc77475.
Cisco IOS XR contains a flaw that may allow a remote denial of service. The issue is triggered when specially crafted MPLS packets are sent to/via MPLS-enabled interfaces on the router and will result in reset of the affected line cards, causing a loss of availability of the traffic switching service.
Currently, there are no known workarounds or upgrades to correct this issue. However, Cisco has released patches for the affected platforms and versions of IOS XR to address this vulnerability.