The RADIUS decoder in tcpdump 3.6.2 and earlier allows remote attackers to cause a denial of service (crash) via an invalid RADIUS packet with a header length field of 0, which causes tcpdump to generate data within an infinite loop.
https://exchange.xforce.ibmcloud.com/vulnerabilities/11324
http://www.redhat.com/support/errata/RHSA-2003-214.html
http://www.redhat.com/support/errata/RHSA-2003-033.html
http://www.redhat.com/support/errata/RHSA-2003-032.html
http://www.mandrakesoft.com/security/advisories?name=MDKSA-2003:027