AS/400 Telnet 5250 terminal emulation clients, as implemented by (1) IBM client access, (2) Bosanova, (3) PowerTerm, (4) Mochasoft, and possibly other emulations, allows malicious AS/400 servers to execute arbitrary commands via a STRPCO (Start PC Organizer) command followed by STRPCCMD (Start PC command), as demonstrated by creating a backdoor account using REXEC.

Stack-based buffer overflow in lpd.exe in Mocha W32 LPD 1.9 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a crafted "recieve jobs" request. NOTE: some of these details are obtained from third party information.