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FTPService.exe in Blackmoon FTP 3.1 Build 1735 and Build 1736 (22.214.171.1246), and possibly other versions before 126.96.36.1997, allows remote attackers to cause a denial of service (crash) via a large number of PORT commands with long arguments, which triggers a NULL pointer dereference. NOTE: some of these details are obtained from third party information.