utility.c in telnetd in netkit telnet through 0.17 allows remote attackers to execute arbitrary code via short writes or urgent data, because of a buffer overflow involving the netclear and nextitem functions. This issue affects Junos OS 12.3, 12.3X48, 15.1, 15.1X49, 16.1, 17.2, 17.2X75, 17.3, 17.4, 18.1, 18.2, 18.2X75, 18.3, 18.4, 19.1, 19.2, 19.3, 19.4, 20.1. A vulnerability in the telnetd Telnet server allows remote attackers to execute arbitrary code via short writes or urgent data, because of a buffer overflow involving the netclear and nextitem functions. This issue only affects systems with inbound Telnet service enabled. SSH service is unaffected by this vulnerability. This issue affects Juniper Networks Junos OS: - 12.3 versions prior to 12.3R12-S16; - 12.3X48 versions prior to 12.3X48-D105; - 15.1 versions prior to 15.1R7-S7; - 15.1X49 versions prior to 15.1X49-D220; - 16.1 versions prior to 16.1R7-S8; - 17.2 versions prior to 17.2R3-S4; - 17.2X75 versio…