CVE-2016-2516: NTP before 4.2.8p7 and 4.3.x before 4.3.92, when mode7 is enabled, allows remote attackers to cause a denia...

Security readout for executives and security teams

This flaw can let a remote attacker crash ntpd on older NTP versions, but only where mode7 is enabled. The direct business risk is loss or disruption of time synchronization, which can affect logging, authentication, monitoring, and operational reliability. Exposure is most likely on systems running vulnerable ntpd versions with mode7 enabled or exposed to untrusted networks. Vendor-packaged NTP deployments covered by Debian, FreeBSD, Gentoo, Oracle, and NetApp advisories should be reviewed. Treat this as a targeted reliability issue for time infrastructure, not a broad compromise indicator. Patch or restrict affected NTP services during normal vulnerability remediation, escalating if critical systems depend on exposed vulnerable ntpd instances. Mitigation focus: Upgrade NTP to 4.2.8p7, 4.3.92, or a vendor-fixed package.; Disable mode7 if it is not operationally required.; Restrict NTP control access to trusted management networks..

Prepared

Jun 13, 2026, 06:20 UTC (UTC+00:00)

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