The default configuration of the POP server in TCP/IP Services 5.6 for HP OpenVMS 8.3 does not log the source IP address or attempted username for login attempts, which might help remote attackers to avoid identification.
Exploitability
AV:NAC:LAu:NImpact
C:NI:PA:N5/AV:N/AC:L/Au:N/C:N/I:P/A:N