The Perforce service (p4s.exe) in Perforce Server 2007.3/143793 and earlier allows remote attackers to cause a denial of service (daemon crash) via a server-DiffFile command with an integer value within a certain range, which causes a loop until all memory is exhausted.

More... (http://nvd.nist.gov/nvd.cfm?cvename=CVE-2008-1338)