CVE-2015-3405: Debian Linux

High severity, CVSS 7.5. EPSS: 5.3% chance of exploitation in the next 30 days.

ntp-keygen in ntp 4.2.8px before 4.2.8p2-RC2 and 4.3.x before 4.3.12 does not generate MD5 keys with sufficient entropy on big endian machines when the lowest order byte of the temp variable is between 0x20 and 0x7f and not #, which might allow remote attackers to obtain the value of generated MD5 keys via a brute force attack with the 93 possible keys.

Affected products

• Debian Debian Linux: version 7.0 only; version 8.0 only
• Fedoraproject Fedora: version 21 only
• Ntp Ntp: version 4.2.8 only; version 4.3.0 only; version 4.3.1 only; version 4.3.2 only; version 4.3.3 only; version 4.3.4 only; …
• Opensuse Suse Linux Enterprise Server: version 11.0 only
• Opensuse Project Suse Linux Enterprise Desktop: version 11.0 only
• Red Hat Enterprise Linux Desktop: version 6.0 only
• Red Hat Enterprise Linux For IBM Z Systems: version 6.0 only
• Red Hat Enterprise Linux For Power Big Endian: version 6.0 only
• Red Hat Enterprise Linux For Scientific Computing: version 6.0 only
• Red Hat Enterprise Linux Server: version 6.0 only
• Red Hat Enterprise Linux Server From Rhui 6: version 6.0 only
• Red Hat Enterprise Linux Workstation: version 6.0 only
• Suse Suse Linux Enterprise Server: version 11.0 only

Published 2017-08-09. Last modified 2026-06-17.