Telnet Flaw: 800,000 Servers at Risk Amid Active Attacks

Bankinfosecurity • January 27, 2026

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The U.S. Cybersecurity and Infrastructure Security Agency on Monday added the flaw to its catalog of known exploited vulnerabilities , setting a Feb.

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Telnet Vulnerability Exposes 800,000 Servers to Active Attacks A critical vulnerability in the telnetd server software has been identified, putting approximately 800,000 servers at risk. The U.S. Cybersecurity and Infrastructure Security Agency has added this flaw to its catalog of known exploited vulnerabilities, prompting urgent attention from system administrators. 2 sources 25

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