ExtraHop named a Leader in the 2025 Forrester Wave™: Network Analysis And Visibility Solutions

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DETECTION OVERVIEW

New Telnet Activity

Risk Factors

While the Telnet protocol is an older and vulnerable protocol, it is often enabled by default. Data is sent over the Telnet protocol as plaintext, which increases the risk of exposing passwords to attackers and leading to further exploits of higher-value assets.

The system might change the risk score for this detection.

Category

Caution
Detection diagram
Next in Caution: Non-standard SSH Port

Attack Background

N/A

Mitigation Options

Disable Telnet unless required

Configure a firewall to block untrusted IP addresses from accessing devices that have Telnet enabled

Implement strict access controls to devices that have Telnet enabled

Associated content

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Learn why you need to be wary of the claims certain network detection and response providers make about their coverage against the MITRE ATT&CK framework.

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