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As a consequence, a message with a spoofed IP address of another server could cause two servers running ntpd-rs to continually respond to each other, consuming significant amounts of resources.\n\n# Impact\n\nAny time server running ntpd-rs with version between 1.2.0 and 1.6.1 inclusive which allows non-NTS traffic is affected. Client-only configurations are not affected. Affected users are recommended to upgrade to version 1.6.2 as soon as possible.\n\n# Workarounds\n\nShould upgrading not be possible, the impact of the issue can be mitigated by:\n - Whitelisting access to only IP addresses of clients using the server, using the ignore filter method.\n - Blocking incoming non-request traffic on the NTP server port using a firewall.\n - Disabling public access to the vulnerable NTP server\n - Disabling the server functionality by removing any [server] sections from the configuration.\n\n# Acknowledgements\n\nThe ntpd-rs authors thank Eric Sesterhenn from X41 D-Sec GmbH for finding and reporting this issue.","state":0,"publishedAt":"2025-08-29T20:07:27+00:00","modifiedAt":"2025-08-29T21:58:17+00:00","affected":[{"ecosystem":"crates.io","name":"ntpd-rs","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"1.2.0"},{"kind":"fixed","version":"1.6.2"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/pendulum-project/ntpd-rs/security/advisories/GHSA-4855-q42w-5vr4","https://nvd.nist.gov/vuln/detail/CVE-2025-58066","https://github.com/pendulum-project/ntpd-rs/commit/da37cf167736cbd4d7804b1ed7ceb572468298e0","https://github.com/pendulum-project/ntpd-rs"],"sourceUrl":"https://github.com/advisories/GHSA-4855-q42w-5vr4","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-4855-q42w-5vr4","identifiers":["GHSA-4855-q42w-5vr4","CVE-2025-58066"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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