fetchnews in leafnode 1.9.48 to 1.11.1 allows remote NNTP servers to cause a denial of service (crash) by closing the connection while fetchnews is reading (1) an article header or (2) an article body, which also prevents fetchnews from querying other servers.
http://www.vupen.com/english/advisories/2005/0468
http://secunia.com/advisories/15252
http://leafnode.sourceforge.net/leafnode-SA-2005-01.txt
http://archives.neohapsis.com/archives/vulnwatch/2005-q2/0037.html