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In page Telnet:

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Telnet is vulnerable to network-based cyberattacks, such as packet sniffing sensitive information including passwords and fingerprinting.[1] [2] [3] Telnet services can be exploited to leak information about the server (such as hostnames, IP addresses, and brand) by packet sniffing the banner. This information can then be searched to determine if a Telnet service accepts a connection without authentication. Telnet is frequently exploited by malware due to being improperly configured.[4] Telnet is targeted by attackers more frequently than other common protocols, especially when compared to UPnP, CoAP, MQTT, AMQP, and XMPP.[citation needed] Common devices targeted are Internet of things devices, routers, and modems.