rxvt 2.6.4 opens a terminal window on :0 if the DISPLAY environment variable is not set, which might allow local users to hijack X11 connections. NOTE: it was later reported that rxvt-unicode, mrxvt, aterm, multi-aterm, and wterm are also affected. NOTE: realistic attack scenarios require that the victim enters a command on the wrong machine.
Exploitability
AV:LAC:HAu:NImpact
C:PI:PA:P3.7/AV:L/AC:H/Au:N/C:P/I:P/A:P