CVE catalog

CVE-2020-11868

ntpsec affected and fixed versions

ntpd in ntp before 4.2.8p14 and 4.3.x before 4.3.100 allows an off-path attacker to block unauthenticated synchronization via a server mode packet with a spoofed source IP address, because transmissions are rescheduled even when a packet lacks a valid origin timestamp.

Severity: High · CVSS 7.5CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: Mar 3, 2020, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 2.12% · 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-2020-11868]
Debiantrixie	ntpsec	`1.2.3+dfsg1-8`	Not affected	[CVE-2020-11868]
Debiansid	ntpsec	Not reported	Not affectedDistribution reports not affected	[CVE-2020-11868]
Debiansid	ntpsec	`1.2.5+dfsg-1`	Not affected	[CVE-2020-11868]
Ubuntupro	ntp	`1:4.2.8p12+dfsg-3ubuntu2`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-11868]Oct 24, 2025, 4:48:26 AM UTC
Ubuntupro	ntp	`1:4.2.8p12+dfsg-3ubuntu3`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-11868]Oct 24, 2025, 4:48:26 AM UTC
Ubuntupro	ntp	`1:4.2.8p12+dfsg-3ubuntu4`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-11868]Oct 24, 2025, 4:48:26 AM UTC
Ubuntupro	ntp	`1:4.2.8p12+dfsg-3ubuntu4.20.04.1`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-11868]Oct 24, 2025, 4:48:26 AM UTC
Ubuntupro	ntp	`1:4.2.8p12+dfsg-3ubuntu4.20.04.1+esm1`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-11868]Oct 24, 2025, 4:48:26 AM UTC
Debianforky	ntpsec	Not reported	Not affectedDistribution reports not affected	[CVE-2020-11868]
Debianforky	ntpsec	`1.2.5+dfsg-1`	Not affected	[CVE-2020-11868]
Debianbookworm-security	ntpsec	`1.2.2+dfsg1-1+deb12u1`	Not affected	[CVE-2020-11868]

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-2020-11868]
Debianbookworm	ntpsec	`1.2.2+dfsg1-1+deb12u1`	Not affected	[CVE-2020-11868]
Debianbookworm-security	ntpsec	`1.2.2+dfsg1-1+deb12u1`	Not affected	[CVE-2020-11868]
Debianforky	ntpsec	Not reported	Not affectedDistribution reports not affected	[CVE-2020-11868]
Debianforky	ntpsec	`1.2.5+dfsg-1`	Not affected	[CVE-2020-11868]
Debiansid	ntpsec	Not reported	Not affectedDistribution reports not affected	[CVE-2020-11868]
Debiansid	ntpsec	`1.2.5+dfsg-1`	Not affected	[CVE-2020-11868]
Debiantrixie	ntpsec	Not reported	Not affectedDistribution reports not affected	[CVE-2020-11868]
Debiantrixie	ntpsec	`1.2.3+dfsg1-8`	Not affected	[CVE-2020-11868]
Ubuntu16.04	ntp	`1:4.2.6.p5+dfsg-3ubuntu8`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-11868]Oct 24, 2025, 4:48:26 AM UTC
Ubuntu16.04	ntp	`1:4.2.6.p5+dfsg-3ubuntu8.1`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-11868]Oct 24, 2025, 4:48:26 AM UTC
Ubuntu16.04	ntp	`1:4.2.6.p5+dfsg-3ubuntu9`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-11868]Oct 24, 2025, 4:48:26 AM UTC
Ubuntu16.04	ntp	`1:4.2.8p4+dfsg-3ubuntu1`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-11868]Oct 24, 2025, 4:48:26 AM UTC
Ubuntu16.04	ntp	`1:4.2.8p4+dfsg-3ubuntu2`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-11868]Oct 24, 2025, 4:48:26 AM UTC
Ubuntu16.04	ntp	`1:4.2.8p4+dfsg-3ubuntu3`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-11868]Oct 24, 2025, 4:48:26 AM UTC
Ubuntu16.04	ntp	`1:4.2.8p4+dfsg-3ubuntu4`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-11868]Oct 24, 2025, 4:48:26 AM UTC
Ubuntu16.04	ntp	`1:4.2.8p4+dfsg-3ubuntu5`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-11868]Oct 24, 2025, 4:48:26 AM UTC
Ubuntu16.04	ntp	`1:4.2.8p4+dfsg-3ubuntu5.1`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-11868]Oct 24, 2025, 4:48:26 AM UTC
Ubuntu16.04	ntp	`1:4.2.8p4+dfsg-3ubuntu5.10`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-11868]Oct 24, 2025, 4:48:26 AM UTC
Ubuntu16.04	ntp	`1:4.2.8p4+dfsg-3ubuntu5.2`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-11868]Oct 24, 2025, 4:48:26 AM UTC
Ubuntu16.04	ntp	`1:4.2.8p4+dfsg-3ubuntu5.3`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-11868]Oct 24, 2025, 4:48:26 AM UTC
Ubuntu16.04	ntp	`1:4.2.8p4+dfsg-3ubuntu5.4`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-11868]Oct 24, 2025, 4:48:26 AM UTC
Ubuntu16.04	ntp	`1:4.2.8p4+dfsg-3ubuntu5.5`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-11868]Oct 24, 2025, 4:48:26 AM UTC
Ubuntu16.04	ntp	`1:4.2.8p4+dfsg-3ubuntu5.6`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-11868]Oct 24, 2025, 4:48:26 AM UTC
Ubuntu16.04	ntp	`1:4.2.8p4+dfsg-3ubuntu5.7`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-11868]Oct 24, 2025, 4:48:26 AM UTC
Ubuntu16.04	ntp	`1:4.2.8p4+dfsg-3ubuntu5.8`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-11868]Oct 24, 2025, 4:48:26 AM UTC
Ubuntu16.04	ntp	`1:4.2.8p4+dfsg-3ubuntu5.9`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-11868]Oct 24, 2025, 4:48:26 AM UTC
Ubuntu22.04	ntp	`1:4.2.8p12+dfsg-3ubuntu6`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-11868]Oct 24, 2025, 4:48:26 AM UTC
Ubuntu22.04	ntp	`1:4.2.8p15+dfsg-1ubuntu1`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-11868]Oct 24, 2025, 4:48:26 AM UTC
Ubuntu22.04	ntp	`1:4.2.8p15+dfsg-1ubuntu2`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-11868]Oct 24, 2025, 4:48:26 AM UTC
Ubuntupro	ntp	`1:4.2.8p12+dfsg-3ubuntu2`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-11868]Oct 24, 2025, 4:48:26 AM UTC
Ubuntupro	ntp	`1:4.2.8p12+dfsg-3ubuntu3`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-11868]Oct 24, 2025, 4:48:26 AM UTC
Ubuntupro	ntp	`1:4.2.8p12+dfsg-3ubuntu4`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-11868]Oct 24, 2025, 4:48:26 AM UTC
Ubuntupro	ntp	`1:4.2.8p12+dfsg-3ubuntu4.20.04.1`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-11868]Oct 24, 2025, 4:48:26 AM UTC
Ubuntupro	ntp	`1:4.2.8p12+dfsg-3ubuntu4.20.04.1+esm1`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-11868]Oct 24, 2025, 4:48:26 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-2020-11868",
      "fixed_version": "",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2020-11868",
      "provider_updated_at": "2025-10-24T04:48:26Z",
      "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-2020-11868",
      "fixed_version": "",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2020-11868",
      "provider_updated_at": "2025-10-24T04:48:26Z",
      "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-2020-11868",
      "fixed_version": "",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2020-11868",
      "provider_updated_at": "2025-10-24T04:48:26Z",
      "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, 5:47:00 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]