The LPD server in cyan soft Opium OPI Server 4.10.1028 and earlier; cyanPrintIP Easy OPI, Professional, and Basic 4.10.1030 and earlier; Workstation 4.10.836 and earlier; and Standard 4.10.940 and earlier; allows remote attackers to cause a denial of service (daemon crash) via a connection that begins with (1) a "Send queue state" LPD command 3 or (2) a "Send queue state" LPD command 4.