The recvn and sendn functions in nylon 0.2 do not check when the recv function call returns 0, which allows remote attackers to cause a denial of service (infinite loop and CPU consumption) by closing the connection while recv is executing.
https://exchange.xforce.ibmcloud.com/vulnerabilities/10334
http://www.securityfocus.com/bid/5938
http://www.security-express.com/archives/bugtraq/2002-10/0146.html