iDEFENSE Security Advisory 02.27.03 – Tcpdump v3.6 to 3.7.1 contains a remote denial of service vulnerability in the parsing of ISAKMP packets which allows malformed packets on TCP or UDP port 500 to cause tcpdump to stop processing packets.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/30859/02.27.03.txt
Source: https://packetstormsecurity.com/files/30859/iDEFENSE-Security-Advisory-2003-02-27.t.html