Cisco Security Advisory - A device running Cisco IOS Software, Cisco IOS XE Software, or Cisco IOS XR Software is vulnerable to a remote denial of service (DoS) condition if it is configured for Multiprotocol Label Switching (MPLS) and has support for Label Distribution Protocol (LDP). A crafted LDP UDP packet can cause an affected device running Cisco IOS Software or Cisco IOS XE Software to reload. On devices running affected versions of Cisco IOS XR Software, such packets can cause the device to restart the mpls_ldp process. A system is vulnerable if configured with either LDP or Tag Distribution Protocol (TDP). Cisco has released free software updates that address this vulnerability. Workarounds that mitigate this vulnerability are available.
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