The default configuration of the POP server in TCP/IP Services 5.6 for HP OpenVMS 8.3 generates different responses depending on whether or not a username is valid, which allows remote attackers to enumerate valid POP usernames.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Openvms | Hp | 8.3 (including) | 8.3 (including) |