{"id":"CVE-2019-11331","aliases":["EUVD-2019-3012","GHSA-2c4g-qfqp-42mh"],"status":"published","title":"Network Time Protocol (NTP), as specified in RFC 5905, uses port 123 even for modes where a fixed...","description":"Network Time Protocol (NTP), as specified in RFC 5905, uses port 123 even for modes where a fixed port number is not required, which makes it easier for remote attackers to conduct off-path attacks.","severity":{"version":"3.0","score":8.1,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.02275,"percentile":0.83207,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2019-04-18T21:58:36Z","modified":"2026-06-17T02:12:43Z","products":[{"vendor":"ntp","product":"ntp"}],"references":[{"url":"https://tools.ietf.org/html/draft-gont-ntp-port-randomization-00","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"http://www.securityfocus.com/bid/108010","tags":["vdb-entry","x_refsource_BID","x_transferred","Third Party Advisory"]},{"url":"https://support.f5.com/csp/article/K09940637","tags":["x_refsource_CONFIRM","x_transferred"]},{"url":"https://support.f5.com/csp/article/K09940637?utm_source=f5support\u0026amp%3Butm_medium=RSS","tags":["x_refsource_CONFIRM","x_transferred"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2019-11331"},{"url":"https://support.f5.com/csp/article/K09940637?utm_source=f5support\u0026amp;utm_medium=RSS"},{"url":"https://github.com/advisories/GHSA-2c4g-qfqp-42mh"}],"sources":{"cve":[{"id":"CVE-2019-11331","description":"Network Time Protocol (NTP), as specified in RFC 5905, uses port 123 even for modes where a fixed port number is not required, which makes it easier for remote attackers to conduct off-path attacks.","status":"published","published":"2019-04-18T21:58:36Z","modified":"2024-08-04T22:48:09.106Z","updated_at":"2026-11-02T14:20:26.416173Z"}],"euvd":[{"id":"EUVD-2019-3012","description":"Network Time Protocol (NTP), as specified in RFC 5905, uses port 123 even for modes where a fixed port number is not required, which makes it easier for remote attackers to conduct off-path attacks.","status":"published","published":"2019-04-18T21:58:36Z","modified":"2024-08-04T22:48:09Z","updated_at":"2026-11-03T02:40:49.794129Z"}],"ghsa":[{"id":"GHSA-2c4g-qfqp-42mh","title":"Network Time Protocol (NTP), as specified in RFC 5905, uses port 123 even for modes where a fixed...","description":"Network Time Protocol (NTP), as specified in RFC 5905, uses port 123 even for modes where a fixed port number is not required, which makes it easier for remote attackers to conduct off-path attacks.","status":"published","published":"2022-05-24T16:43:56Z","modified":"2024-04-04T00:01:45Z","cvss":[{"version":"3.0","score":8.1,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T14:55:48.925076Z"}],"nvd":[{"id":"CVE-2019-11331","description":"Network Time Protocol (NTP), as specified in RFC 5905, uses port 123 even for modes where a fixed port number is not required, which makes it easier for remote attackers to conduct off-path attacks.","status":"published","published":"2019-04-18T22:29:00.517Z","modified":"2026-06-17T02:12:43.603Z","cvss":[{"version":"3.0","score":8.1,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":6.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:05:11.426883Z"}]}}