PuTTY 0.77 before 0.84 uses a copy of the PuTTY icon as a trust indication for TELNET data but the trust status is not cleared between proxy authentication and the main session.
0.84Exploitability
AV:NAC:HPR:NUI:RScope
S:UImpact
C:NI:LA:N3.1/CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:NOther