What’s Vulnerable › Vulnerabilities

CVE-2016-1550

• Severity: medium (CVSS 5.3 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2017-01-06 · updated 2026-06-17
• Weakness: CWE-200

Description

An exploitable vulnerability exists in the message authentication functionality of libntp in ntp 4.2.8p4 and NTPSec a5fb34b9cc89b92a8fef2f459004865c93bb7f92. An attacker can send a series of crafted messages to attempt to recover the message digest key.

Affected products

• NTP: 4.2.8-p4

References

• http://lists.fedoraproject.org/pipermail/package-announce/2016-May/183647.html
• http://lists.fedoraproject.org/pipermail/package-announce/2016-May/184669.html
• http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00034.html
• http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00037.html
• http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00052.html
• http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00001.html
• http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00020.html
• http://lists.opensuse.org/opensuse-security-announce/2016-07/msg00026.html
• http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00042.html
• http://lists.opensuse.org/opensuse-updates/2016-05/msg00114.html
• http://packetstormsecurity.com/files/136864/Slackware-Security-Advisory-ntp-Updates.html
• http://rhn.redhat.com/errata/RHSA-2016-1552.html

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