CVE-2013-5211: The monlist feature in ntp_request.c in ntpd in NTP before 4.2.7p26 allows remote attackers to cause a deni...

Security readout for executives and security teams

Older NTP servers can be abused as amplifiers in denial-of-service attacks. Attackers do not need to break into the server; they can send forged requests that make it send larger responses toward a victim. The main business risk is service disruption and reputational exposure if your infrastructure participates in DDoS traffic. Internet-reachable systems running NTP before 4.2.7p26 are the primary concern, especially servers allowing legacy monlist-style queries from untrusted networks. Treat this as a high-priority internet-exposure cleanup. It is an availability and abuse risk, not a data-theft issue, but exposed vulnerable NTP servers can contribute to major DDoS events. Mitigation focus: Upgrade NTP to 4.2.7p26 or later, or a vendor-patched package.; Check vendor advisories for supported configuration hardening on affected platforms.; Restrict NTP exposure to trusted networks where operationally possible..

Prepared

Jun 14, 2026, 15:13 UTC (UTC+00:00)

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