Hackers exploit critical telnetd auth bypass flaw to get root

BleepingComputer

January 23, 2026 at 4:21 PM

Actively Exploited

Overview

Hackers are actively exploiting a serious vulnerability in the GNU InetUtils telnetd server that has been around for 11 years. This flaw allows attackers to bypass authentication and gain root access, which poses a significant risk to systems still using this service. Organizations that rely on telnetd are at risk of unauthorized access, potentially leading to data breaches or system compromise. Security experts are urging affected users to address this vulnerability immediately to prevent exploitation. Given the age of the flaw, many systems might still be running unpatched versions, making them easy targets for attackers.

Key Takeaways

Active Exploitation: This vulnerability is being actively exploited by attackers. Immediate action is recommended.
Affected Systems: GNU InetUtils telnetd server
Action Required: Update to the latest version of GNU InetUtils that addresses this vulnerability.
Timeline: Disclosed on [date]

Original Article Summary

A coordinated campaign has been observed targeting a recently disclosed critical-severity vulnerability that has been present in the GNU InetUtils telnetd server for 11 years. [...]

Impact

GNU InetUtils telnetd server

Exploitation Status

This vulnerability is confirmed to be actively exploited by attackers in real-world attacks. Organizations should prioritize patching or implementing workarounds immediately.

Timeline

Disclosed on [date]

Remediation

Update to the latest version of GNU InetUtils that addresses this vulnerability.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

Related Topics: This incident relates to Exploit, Vulnerability, Critical.

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