CVE catalog

CVE-2020-13817

ntpsec affected and fixed versions

ntpd in ntp before 4.2.8p14 and 4.3.x before 4.3.100 allows remote attackers to cause a denial of service (daemon exit or system time change) by predicting transmit timestamps for use in spoofed packets. The victim must be relying on unauthenticated IPv4 time sources. There must be an off-path attacker who can query time from the victim's ntpd instance.

Severity: High · CVSS 7.4CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
Published: Mar 3, 2020, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 3.36% · Oct 27, 2026

Projects and upstream resources

[ntpsec][Source-reported homepage]

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Distribution / release	Package	Version	Status	Source
Debiantrixie	ntpsec	Not reported	Not affectedDistribution reports not affected	[CVE-2020-13817]
Debiantrixie	ntpsec	`1.2.3+dfsg1-8`	Not affected	[CVE-2020-13817]
Debiansid	ntpsec	Not reported	Not affectedDistribution reports not affected	[CVE-2020-13817]
Debiansid	ntpsec	`1.2.5+dfsg-1`	Not affected	[CVE-2020-13817]
Ubuntupro	ntp	`1:4.2.8p12+dfsg-3ubuntu2`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-13817]Oct 24, 2025, 4:48:31 AM UTC
Ubuntupro	ntp	`1:4.2.8p12+dfsg-3ubuntu3`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-13817]Oct 24, 2025, 4:48:31 AM UTC
Ubuntupro	ntp	`1:4.2.8p12+dfsg-3ubuntu4`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-13817]Oct 24, 2025, 4:48:31 AM UTC
Ubuntupro	ntp	`1:4.2.8p12+dfsg-3ubuntu4.20.04.1`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-13817]Oct 24, 2025, 4:48:31 AM UTC
Ubuntupro	ntp	`1:4.2.8p12+dfsg-3ubuntu4.20.04.1+esm1`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-13817]Oct 24, 2025, 4:48:31 AM UTC
Debianforky	ntpsec	Not reported	Not affectedDistribution reports not affected	[CVE-2020-13817]
Debianforky	ntpsec	`1.2.5+dfsg-1`	Not affected	[CVE-2020-13817]
Debianbookworm-security	ntpsec	`1.2.2+dfsg1-1+deb12u1`	Not affected	[CVE-2020-13817]

Showing 12 observations. All 35 observations, including unknown and conflicting reports, are available below.

Provider details and historical evidence

Distribution / release	Package	Version	Status	Source
Debianbookworm	ntpsec	Not reported	Not affectedDistribution reports not affected	[CVE-2020-13817]
Debianbookworm	ntpsec	`1.2.2+dfsg1-1+deb12u1`	Not affected	[CVE-2020-13817]
Debianbookworm-security	ntpsec	`1.2.2+dfsg1-1+deb12u1`	Not affected	[CVE-2020-13817]
Debianforky	ntpsec	Not reported	Not affectedDistribution reports not affected	[CVE-2020-13817]
Debianforky	ntpsec	`1.2.5+dfsg-1`	Not affected	[CVE-2020-13817]
Debiansid	ntpsec	Not reported	Not affectedDistribution reports not affected	[CVE-2020-13817]
Debiansid	ntpsec	`1.2.5+dfsg-1`	Not affected	[CVE-2020-13817]
Debiantrixie	ntpsec	Not reported	Not affectedDistribution reports not affected	[CVE-2020-13817]
Debiantrixie	ntpsec	`1.2.3+dfsg1-8`	Not affected	[CVE-2020-13817]
Ubuntu16.04	ntp	`1:4.2.6.p5+dfsg-3ubuntu8`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-13817]Oct 24, 2025, 4:48:31 AM UTC
Ubuntu16.04	ntp	`1:4.2.6.p5+dfsg-3ubuntu8.1`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-13817]Oct 24, 2025, 4:48:31 AM UTC
Ubuntu16.04	ntp	`1:4.2.6.p5+dfsg-3ubuntu9`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-13817]Oct 24, 2025, 4:48:31 AM UTC
Ubuntu16.04	ntp	`1:4.2.8p4+dfsg-3ubuntu1`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-13817]Oct 24, 2025, 4:48:31 AM UTC
Ubuntu16.04	ntp	`1:4.2.8p4+dfsg-3ubuntu2`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-13817]Oct 24, 2025, 4:48:31 AM UTC
Ubuntu16.04	ntp	`1:4.2.8p4+dfsg-3ubuntu3`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-13817]Oct 24, 2025, 4:48:31 AM UTC
Ubuntu16.04	ntp	`1:4.2.8p4+dfsg-3ubuntu4`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-13817]Oct 24, 2025, 4:48:31 AM UTC
Ubuntu16.04	ntp	`1:4.2.8p4+dfsg-3ubuntu5`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-13817]Oct 24, 2025, 4:48:31 AM UTC
Ubuntu16.04	ntp	`1:4.2.8p4+dfsg-3ubuntu5.1`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-13817]Oct 24, 2025, 4:48:31 AM UTC
Ubuntu16.04	ntp	`1:4.2.8p4+dfsg-3ubuntu5.10`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-13817]Oct 24, 2025, 4:48:31 AM UTC
Ubuntu16.04	ntp	`1:4.2.8p4+dfsg-3ubuntu5.2`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-13817]Oct 24, 2025, 4:48:31 AM UTC
Ubuntu16.04	ntp	`1:4.2.8p4+dfsg-3ubuntu5.3`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-13817]Oct 24, 2025, 4:48:31 AM UTC
Ubuntu16.04	ntp	`1:4.2.8p4+dfsg-3ubuntu5.4`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-13817]Oct 24, 2025, 4:48:31 AM UTC
Ubuntu16.04	ntp	`1:4.2.8p4+dfsg-3ubuntu5.5`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-13817]Oct 24, 2025, 4:48:31 AM UTC
Ubuntu16.04	ntp	`1:4.2.8p4+dfsg-3ubuntu5.6`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-13817]Oct 24, 2025, 4:48:31 AM UTC
Ubuntu16.04	ntp	`1:4.2.8p4+dfsg-3ubuntu5.7`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-13817]Oct 24, 2025, 4:48:31 AM UTC
Ubuntu16.04	ntp	`1:4.2.8p4+dfsg-3ubuntu5.8`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-13817]Oct 24, 2025, 4:48:31 AM UTC
Ubuntu16.04	ntp	`1:4.2.8p4+dfsg-3ubuntu5.9`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-13817]Oct 24, 2025, 4:48:31 AM UTC
Ubuntu22.04	ntp	`1:4.2.8p12+dfsg-3ubuntu6`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-13817]Oct 24, 2025, 4:48:31 AM UTC
Ubuntu22.04	ntp	`1:4.2.8p15+dfsg-1ubuntu1`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-13817]Oct 24, 2025, 4:48:31 AM UTC
Ubuntu22.04	ntp	`1:4.2.8p15+dfsg-1ubuntu2`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-13817]Oct 24, 2025, 4:48:31 AM UTC
Ubuntupro	ntp	`1:4.2.8p12+dfsg-3ubuntu2`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-13817]Oct 24, 2025, 4:48:31 AM UTC
Ubuntupro	ntp	`1:4.2.8p12+dfsg-3ubuntu3`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-13817]Oct 24, 2025, 4:48:31 AM UTC
Ubuntupro	ntp	`1:4.2.8p12+dfsg-3ubuntu4`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-13817]Oct 24, 2025, 4:48:31 AM UTC
Ubuntupro	ntp	`1:4.2.8p12+dfsg-3ubuntu4.20.04.1`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-13817]Oct 24, 2025, 4:48:31 AM UTC
Ubuntupro	ntp	`1:4.2.8p12+dfsg-3ubuntu4.20.04.1+esm1`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-13817]Oct 24, 2025, 4:48:31 AM UTC

Original provider fields

{
  "package_releases": [
    {
      "name": "ntpsec",
      "status": "not affected",
      "release": "sid",
      "version": "1.2.5+dfsg-1"
    },
    {
      "name": "ntpsec",
      "status": "not affected",
      "release": "forky",
      "version": "1.2.5+dfsg-1"
    },
    {
      "name": "ntpsec",
      "status": "not affected",
      "release": "trixie",
      "version": "1.2.3+dfsg1-8"
    },
    {
      "name": "ntpsec",
      "status": "not affected",
      "release": "bookworm",
      "version": "1.2.2+dfsg1-1+deb12u1"
    },
    {
      "name": "ntpsec",
      "status": "not affected",
      "release": "bookworm-security",
      "version": "1.2.2+dfsg1-1+deb12u1"
    }
  ],
  "fixed_versions": [
    {
      "bug": null,
      "name": "ntpsec",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "unimportant",
      "fixed_version": "0"
    },
    {
      "bug": null,
      "name": "ntpsec",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "unimportant",
      "fixed_version": "0"
    },
    {
      "bug": null,
      "name": "ntpsec",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "unimportant",
      "fixed_version": "0"
    },
    {
      "bug": null,
      "name": "ntpsec",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "unimportant",
      "fixed_version": "0"
    }
  ],
  "distribution_packages": [
    {
      "name": "ntp",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "pro",
      "versions": [
        "1:4.2.8p12+dfsg-3ubuntu2",
        "1:4.2.8p12+dfsg-3ubuntu3",
        "1:4.2.8p12+dfsg-3ubuntu4",
        "1:4.2.8p12+dfsg-3ubuntu4.20.04.1",
        "1:4.2.8p12+dfsg-3ubuntu4.20.04.1+esm1"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2020-13817",
      "fixed_version": "",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2020-13817",
      "provider_updated_at": "2025-10-24T04:48:31Z",
      "applicability_unknown": true
    },
    {
      "name": "ntp",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "16.04",
      "versions": [
        "1:4.2.6.p5+dfsg-3ubuntu8",
        "1:4.2.6.p5+dfsg-3ubuntu8.1",
        "1:4.2.6.p5+dfsg-3ubuntu9",
        "1:4.2.8p4+dfsg-3ubuntu1",
        "1:4.2.8p4+dfsg-3ubuntu2",
        "1:4.2.8p4+dfsg-3ubuntu3",
        "1:4.2.8p4+dfsg-3ubuntu4",
        "1:4.2.8p4+dfsg-3ubuntu5",
        "1:4.2.8p4+dfsg-3ubuntu5.1",
        "1:4.2.8p4+dfsg-3ubuntu5.2",
        "1:4.2.8p4+dfsg-3ubuntu5.3",
        "1:4.2.8p4+dfsg-3ubuntu5.4",
        "1:4.2.8p4+dfsg-3ubuntu5.5",
        "1:4.2.8p4+dfsg-3ubuntu5.6",
        "1:4.2.8p4+dfsg-3ubuntu5.7",
        "1:4.2.8p4+dfsg-3ubuntu5.8",
        "1:4.2.8p4+dfsg-3ubuntu5.9",
        "1:4.2.8p4+dfsg-3ubuntu5.10"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2020-13817",
      "fixed_version": "",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2020-13817",
      "provider_updated_at": "2025-10-24T04:48:31Z",
      "applicability_unknown": true
    },
    {
      "name": "ntp",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "22.04",
      "versions": [
        "1:4.2.8p12+dfsg-3ubuntu6",
        "1:4.2.8p15+dfsg-1ubuntu1",
        "1:4.2.8p15+dfsg-1ubuntu2"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2020-13817",
      "fixed_version": "",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2020-13817",
      "provider_updated_at": "2025-10-24T04:48:31Z",
      "applicability_unknown": true
    }
  ]
}

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[ntp]Unknown
Source package: [ntpsec]
Details (4)
- 1:4.2.8p15+dfsg-2~1.2.2+dfsg1-1+deb12u1 · all · bookworm
  Not affected
  dsa · ntpsec · debian · bookworm
- 1:4.2.8p15+dfsg-2~1.2.2+dfsg1-1+deb12u1 · all · bookworm
  Not affected
  dsa · ntpsec · debian · bookworm
- 1:4.2.8p15+dfsg-2~1.2.2+dfsg1-1+deb12u1 · all · bookworm-security
  Not affected
  dsa · ntpsec · debian · bookworm
- 1:4.2.8p15+dfsg-2~1.2.2+dfsg1-1+deb12u1 · all · bookworm-security
  Not affected
  dsa · ntpsec · debian · bookworm
[ntpdate]Unknown
Source package: [ntpsec]
Details (4)
- 1:4.2.8p15+dfsg-2~1.2.2+dfsg1-1+deb12u1 · all · bookworm
  Not affected
  dsa · ntpsec · debian · bookworm
- 1:4.2.8p15+dfsg-2~1.2.2+dfsg1-1+deb12u1 · all · bookworm
  Not affected
  dsa · ntpsec · debian · bookworm
- 1:4.2.8p15+dfsg-2~1.2.2+dfsg1-1+deb12u1 · all · bookworm-security
  Not affected
  dsa · ntpsec · debian · bookworm
- 1:4.2.8p15+dfsg-2~1.2.2+dfsg1-1+deb12u1 · all · bookworm-security
  Not affected
  dsa · ntpsec · debian · bookworm
[ntp-doc]Unknown
Source package: [ntpsec]
Details (4)
- 1:4.2.8p15+dfsg-2~1.2.2+dfsg1-1+deb12u1 · all · bookworm
  Not affected
  dsa · ntpsec · debian · bookworm
- 1:4.2.8p15+dfsg-2~1.2.2+dfsg1-1+deb12u1 · all · bookworm
  Not affected
  dsa · ntpsec · debian · bookworm
- 1:4.2.8p15+dfsg-2~1.2.2+dfsg1-1+deb12u1 · all · bookworm-security
  Not affected
  dsa · ntpsec · debian · bookworm
- 1:4.2.8p15+dfsg-2~1.2.2+dfsg1-1+deb12u1 · all · bookworm-security
  Not affected
  dsa · ntpsec · debian · bookworm
[ntpsec]Unknown
Details (4)
- 1.2.2+dfsg1-1+deb12u1 · amd64 · bookworm
  Not affected
  dsa · ntpsec · debian · bookworm
- 1.2.2+dfsg1-1+deb12u1 · arm64 · bookworm
  Not affected
  dsa · ntpsec · debian · bookworm
- 1.2.2+dfsg1-1+deb12u1 · amd64 · bookworm-security
  Not affected
  dsa · ntpsec · debian · bookworm
- 1.2.2+dfsg1-1+deb12u1 · arm64 · bookworm-security
  Not affected
  dsa · ntpsec · debian · bookworm
[ntpsec-doc]Unknown
Source package: [ntpsec]
Details (4)
- 1.2.2+dfsg1-1+deb12u1 · all · bookworm
  Not affected
  dsa · ntpsec · debian · bookworm
- 1.2.2+dfsg1-1+deb12u1 · all · bookworm
  Not affected
  dsa · ntpsec · debian · bookworm
- 1.2.2+dfsg1-1+deb12u1 · all · bookworm-security
  Not affected
  dsa · ntpsec · debian · bookworm
- 1.2.2+dfsg1-1+deb12u1 · all · bookworm-security
  Not affected
  dsa · ntpsec · debian · bookworm
[ntpsec-ntpdate]Unknown
Source package: [ntpsec]
Details (4)
- 1.2.2+dfsg1-1+deb12u1 · amd64 · bookworm
  Not affected
  dsa · ntpsec · debian · bookworm
- 1.2.2+dfsg1-1+deb12u1 · arm64 · bookworm
  Not affected
  dsa · ntpsec · debian · bookworm
- 1.2.2+dfsg1-1+deb12u1 · amd64 · bookworm-security
  Not affected
  dsa · ntpsec · debian · bookworm
- 1.2.2+dfsg1-1+deb12u1 · arm64 · bookworm-security
  Not affected
  dsa · ntpsec · debian · bookworm
[ntpsec-ntpdig]Unknown
Source package: [ntpsec]
Details (4)
- 1.2.2+dfsg1-1+deb12u1 · amd64 · bookworm
  Not affected
  dsa · ntpsec · debian · bookworm
- 1.2.2+dfsg1-1+deb12u1 · arm64 · bookworm
  Not affected
  dsa · ntpsec · debian · bookworm
- 1.2.2+dfsg1-1+deb12u1 · amd64 · bookworm-security
  Not affected
  dsa · ntpsec · debian · bookworm
- 1.2.2+dfsg1-1+deb12u1 · arm64 · bookworm-security
  Not affected
  dsa · ntpsec · debian · bookworm
[ntpsec-ntpviz]Unknown
Source package: [ntpsec]
Details (4)
- 1.2.2+dfsg1-1+deb12u1 · amd64 · bookworm
  Not affected
  dsa · ntpsec · debian · bookworm
- 1.2.2+dfsg1-1+deb12u1 · arm64 · bookworm
  Not affected
  dsa · ntpsec · debian · bookworm
- 1.2.2+dfsg1-1+deb12u1 · amd64 · bookworm-security
  Not affected
  dsa · ntpsec · debian · bookworm
- 1.2.2+dfsg1-1+deb12u1 · arm64 · bookworm-security
  Not affected
  dsa · ntpsec · debian · bookworm
[python3-ntp]Unknown
Source package: [ntpsec]
Details (4)
- 1.2.2+dfsg1-1+deb12u1 · amd64 · bookworm
  Not affected
  dsa · ntpsec · debian · bookworm
- 1.2.2+dfsg1-1+deb12u1 · arm64 · bookworm
  Not affected
  dsa · ntpsec · debian · bookworm
- 1.2.2+dfsg1-1+deb12u1 · amd64 · bookworm-security
  Not affected
  dsa · ntpsec · debian · bookworm
- 1.2.2+dfsg1-1+deb12u1 · arm64 · bookworm-security
  Not affected
  dsa · ntpsec · debian · bookworm
[sntp]Unknown
Source package: [ntpsec]
Details (4)
- 1:4.2.8p15+dfsg-2~1.2.2+dfsg1-1+deb12u1 · all · bookworm
  Not affected
  dsa · ntpsec · debian · bookworm
- 1:4.2.8p15+dfsg-2~1.2.2+dfsg1-1+deb12u1 · all · bookworm
  Not affected
  dsa · ntpsec · debian · bookworm
- 1:4.2.8p15+dfsg-2~1.2.2+dfsg1-1+deb12u1 · all · bookworm-security
  Not affected
  dsa · ntpsec · debian · bookworm
- 1:4.2.8p15+dfsg-2~1.2.2+dfsg1-1+deb12u1 · all · bookworm-security
  Not affected
  dsa · ntpsec · debian · bookworm

Observed: Oct 23, 2026, 5:47:44 PM UTC

References

[CERT-Bund public advisories] · [CISA cybersecurity advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]