{"cve":"CVE-2019-11331","nvd":{"published":"2019-04-18T22:29:00.517","modified":"2026-06-17T02:12:43.603","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.0","vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","score":8.1},"cwes":[],"references":["http://www.securityfocus.com/bid/108010","https://support.f5.com/csp/article/K09940637","https://support.f5.com/csp/article/K09940637?utm_source=f5support&amp%3Butm_medium=RSS","https://tools.ietf.org/html/draft-gont-ntp-port-randomization-00","http://www.securityfocus.com/bid/108010"],"products":["ntp:ntp"],"source":"nvd","synced_at":"2026-10-19T20:56:19.218283075+00:00"},"epss":{"cve":"CVE-2019-11331","score":0.02637,"percentile":0.85564,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}