CVE-2007-0956: Canonical Ubuntu Linux

High severity, CVSS 10.0. EPSS: 29.8% chance of exploitation in the next 30 days.

The telnet daemon (telnetd) in MIT krb5 before 1.6.1 allows remote attackers to bypass authentication and gain system access via a username beginning with a '-' character, a similar issue to CVE-2007-0882.

Affected products

• Canonical Ubuntu Linux: version 5.10 only; version 6.06 only; version 6.10 only
• Debian Debian Linux: version 3.1 only; version 4.0 only
• Mit Kerberos 5: before 1.6.1 (fixed in 1.6.1)

Published 2007-04-06. Last modified 2026-06-16.