The MultipacketReciever::RecievePacket function in S.T.A.L.K.E.R.: Shadow of Chernobyl 1.0006 and earlier allows remote attackers to cause a denial of service (server termination) via a crafted packet without an expected 0xe0 or 0xe1 value, which triggers the INT3 instruction.
https://exchange.xforce.ibmcloud.com/vulnerabilities/43458
http://www.securityfocus.com/bid/29997