CVE-2016-2517: NTP before 4.2.8p7 and 4.3.x before 4.3.92 allows remote attackers to cause a denial of service (prevent su...

Security readout for executives and security teams

This vulnerability can let someone who already knows sensitive NTP control or request keys disrupt authenticated NTP management. The main business impact is denial of service to time-service administration, not confirmed system takeover. Exposure matters most where older ntpd versions are still used on servers, appliances, or network infrastructure. Likely exposure is limited to systems running affected ntpd versions where controlkey or requestkey values are known, disclosed, reused, or otherwise reachable by an attacker. Internet-facing or appliance-managed NTP services deserve priority review. Treat as a targeted reliability risk for legacy time infrastructure. Prioritize patching exposed or appliance-managed NTP services, especially where time integrity supports authentication, logging, finance, or operational systems. Mitigation focus: Upgrade NTP to 4.2.8p7, 4.3.92, or a vendor-fixed package.; Apply relevant OS or appliance vendor advisories for bundled NTP components.; Review exposure of ntpd control and request key material..

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.