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CVE-2026-24061

CRITICAL CVSS 3.1: 9.8 EPSS 75.6% ACTIVE EXPLOIT
Updated Jan 21, 2026
telnetd

CISA Known Exploited Vulnerability (KEV)

This vulnerability is actively exploited in the wild. Immediate patching is strongly recommended.

Due Date: Feb 16, 2026

Parameter Value
CVSS 9.8 (CRITICAL)
Type CWE-88
Vendor telnetd
Public PoC Yes

telnetd in GNU Inetutils through 2.7 allows remote authentication bypass via a "-f root" value for the USER environment variable.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service

CVSS Vector v3.1

Weakness Type (CWE)

CWE-88

References 3

https://www.gnu.org/software/inetutils/
cve@mitre.org
https://www.openwall.com/lists/oss-security/2026/01/20/2
cve@mitre.org
https://www.openwall.com/lists/oss-security/2026/01/20/8
cve@mitre.org
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