It indicates a possible exploit of a Denial of Service vulnerability in TCPDump. TCPDump is vulnerable to a Denial of Service attack. TCPDump has a programming flaw when decoding Label Distribution Protocol (LDP) datagrams. An attacker can cause the software to crash by sending malformed LDP datagrams.
LBL tcpdump 3.4 - LBL tcpdump 3.8.3
Denial of Service
Apply appropriate patch from the vendor or Upgrade to non-vulnerable version if available.