| Port No | 23 |
| Service Name | telnet |
| RFC Doc | 854 |
| Protocol | TCP |
| Description | Telnet, running at TCP port 23, is one of the oldest protocols on the Internet, allowing remote logins to UNIX machines. |
| Reference Link | Telnet Protocol Specification: RFC854 Exploits against Telnet |
| Attack | Since cleartext user authenticaiton and session is used, session hijacking is possible. |
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