CVE-2007-0956: The telnet daemon (telnetd) in MIT krb5 before 1.6.1 allows remote attackers to bypass authentication and g...

Security readout for executives and security teams

CVE-2007-0956 is an authentication bypass in the MIT Kerberos telnet daemon. If an affected telnet service is reachable, a remote attacker could gain system access without normal authentication. This is most urgent for legacy UNIX/Linux environments that still expose Kerberos telnet services. Exposure is likely limited to systems running MIT krb5 telnetd or vendor-packaged Kerberos telnet services. Internet-facing or broadly reachable telnet services carry the highest risk. Environments that retired telnet or do not use krb5 telnetd are unlikely to be exposed. Prioritize remediation if any telnet service is reachable from untrusted networks or supports privileged administration. For organizations without Kerberos telnetd, this should be a targeted legacy-service verification rather than a broad emergency program. Mitigation focus: Upgrade MIT krb5 to 1.6.1 or a vendor-fixed package.; Disable Kerberos telnetd where it is not business-critical.; Restrict telnet access to trusted management networks only..

Prepared

Jun 29, 2026, 06:24 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.