Vulnerability-Lookup

CVE-2016-4955 (GCVE-0-2016-4955)

Vulnerability from cvelistv5 – Published: 2016-07-05 01:00 – Updated: 2024-08-06 00:46

Summary

ntpd in NTP 4.x before 4.2.8p8, when autokey is enabled, allows remote attackers to cause a denial of service (peer-variable clearing and association outage) by sending (1) a spoofed crypto-NAK packet or (2) a packet with an incorrect MAC value at a certain time.

Severity

5.9 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE

Assigner

mitre mitre root

References

31 references

URL	Tags
http://lists.opensuse.org/opensuse-security-annou…	vendor-advisoryx_refsource_SUSE
http://www.ubuntu.com/usn/USN-3096-1	vendor-advisoryx_refsource_UBUNTU
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
http://lists.opensuse.org/opensuse-security-annou…	vendor-advisoryx_refsource_SUSE
https://security.FreeBSD.org/advisories/FreeBSD-S…	vendor-advisoryx_refsource_FREEBSD
http://lists.opensuse.org/opensuse-security-annou…	vendor-advisoryx_refsource_SUSE
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
http://www.securityfocus.com/bid/91007	vdb-entryx_refsource_BID
http://support.ntp.org/bin/view/Main/NtpBug3043	x_refsource_CONFIRM
http://www.securitytracker.com/id/1036037	vdb-entryx_refsource_SECTRACK
http://lists.opensuse.org/opensuse-security-annou…	vendor-advisoryx_refsource_SUSE
http://www.oracle.com/technetwork/topics/security…	x_refsource_CONFIRM
http://lists.opensuse.org/opensuse-security-annou…	vendor-advisoryx_refsource_SUSE
http://bugs.ntp.org/3043	x_refsource_CONFIRM
http://www.kb.cert.org/vuls/id/321640	third-party-advisoryx_refsource_CERT-VN
http://support.ntp.org/bin/view/Main/SecurityNotice	x_refsource_CONFIRM
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
http://lists.opensuse.org/opensuse-security-annou…	vendor-advisoryx_refsource_SUSE
http://lists.opensuse.org/opensuse-security-annou…	vendor-advisoryx_refsource_SUSE
https://security.gentoo.org/glsa/201607-15	vendor-advisoryx_refsource_GENTOO
http://packetstormsecurity.com/files/137321/Slack…	x_refsource_MISC
http://tools.cisco.com/security/center/content/Ci…	vendor-advisoryx_refsource_CISCO
http://packetstormsecurity.com/files/137322/FreeB…	x_refsource_MISC
http://lists.opensuse.org/opensuse-security-annou…	vendor-advisoryx_refsource_SUSE
http://www.securityfocus.com/archive/1/538599/100…	mailing-listx_refsource_BUGTRAQ
http://www.securityfocus.com/archive/1/538600/100…	mailing-listx_refsource_BUGTRAQ
https://www.kb.cert.org/vuls/id/321640	third-party-advisoryx_refsource_CERT-VN
http://www.securityfocus.com/archive/1/archive/1/…	mailing-listx_refsource_BUGTRAQ
http://www.securityfocus.com/archive/1/archive/1/…	mailing-listx_refsource_BUGTRAQ
https://cert-portal.siemens.com/productcert/pdf/s…	x_refsource_CONFIRM
https://us-cert.cisa.gov/ics/advisories/icsa-21-159-11	x_refsource_MISC

Date Public

2016-06-02 00:00

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    "dateReserved": "2016-05-23T00:00:00.000Z",
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Advisory\"]},{\"url\":\"http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00024.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00028.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00040.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"http://lists.opensuse.org/opensuse-security-announce/2016-07/msg00026.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00042.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"http://packetstormsecurity.com/files/137321/Slackware-Security-Advisory-ntp-Updates.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"http://packetstormsecurity.com/files/137322/FreeBSD-Security-Advisory-FreeBSD-SA-16-24.ntp.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"http://support.ntp.org/bin/view/Main/NtpBug3043\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\",\"Vendor Advisory\"]},{\"url\":\"http://support.ntp.org/bin/view/Main/SecurityNotice\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Release Notes\",\"Vendor Advisory\"]},{\"url\":\"http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160603-ntpd\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"http://www.kb.cert.org/vuls/id/321640\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\",\"US Government Resource\"]},{\"url\":\"http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"http://www.securityfocus.com/archive/1/538599/100/0/threaded\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"http://www.securityfocus.com/archive/1/538600/100/0/threaded\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"http://www.securityfocus.com/archive/1/archive/1/538599/100/0/threaded\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"http://www.securityfocus.com/archive/1/archive/1/538600/100/0/threaded\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"http://www.securityfocus.com/bid/91007\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\",\"VDB Entry\"]},{\"url\":\"http://www.securitytracker.com/id/1036037\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\",\"VDB Entry\"]},{\"url\":\"http://www.ubuntu.com/usn/USN-3096-1\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://cert-portal.siemens.com/productcert/pdf/ssa-211752.pdf\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/K3EYJQHJZ2KTVQ7ICEFHXTLZ36MRASWX/\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ORAMN3Q7TVJ54MBYF75XCJOE3DP7LYHT/\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WNWGCQLW2VY72NIUYMJOCAKJKTXHDUK2/\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://security.FreeBSD.org/advisories/FreeBSD-SA-16:24.ntp.asc\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://security.gentoo.org/glsa/201607-15\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://us-cert.cisa.gov/ics/advisories/icsa-21-159-11\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://www.kb.cert.org/vuls/id/321640\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2025-11-21T12:01:47+00:00",
      "cve": "CVE-2016-4955",
      "id": "CVE-2016-4955",
      "initial_release_date": "2016-06-02T00:00:00+00:00",
      "product_status:known_affected": "12",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "ntp: autokey association reset",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2016/cve-2016-4955.json",
      "version": "3"
    }
  }
}

SUSE-SU-2016:1563-1

Vulnerability from csaf_suse - Published: 2016-06-13 12:31 - Updated: 2016-06-13 12:31

Summary

Security update for ntp

Severity

Important

Scope

5 vulnerabilities in this advisory, including CVE-2016-4955.

CVE-2016-4955

5.9 (Medium)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Recommended: 14 products

Open the full advisory

SUSE-SU-2016:1568-1

Vulnerability from csaf_suse - Published: 2016-06-14 06:45 - Updated: 2016-06-14 06:45

Summary

Security update for ntp

Severity

Important

Scope

17 vulnerabilities in this advisory, including CVE-2016-4955.

CVE-2016-4955

5.9 (Medium)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Recommended: 14 products

Open the full advisory

SUSE-SU-2016:1584-1

Vulnerability from csaf_suse - Published: 2016-06-15 08:36 - Updated: 2016-06-15 08:36

Summary

Security update for ntp

Severity

Important

Scope

5 vulnerabilities in this advisory, including CVE-2016-4955.

CVE-2016-4955

5.9 (Medium)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Recommended: 20 products

Open the full advisory

SUSE-SU-2016:1602-1

Vulnerability from csaf_suse - Published: 2016-06-17 09:07 - Updated: 2016-06-17 09:07

Summary

Security update for ntp

Severity

Important

Scope

5 vulnerabilities in this advisory, including CVE-2016-4955.

CVE-2016-4955

5.9 (Medium)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Recommended: 26 products

Open the full advisory

ubuntu-cve-2016-4955

Vulnerability from osv_ubuntu

Published

2016-07-04 00:00

Modified

2025-09-08 16:43

Summary

Details

Severity

5.9 (Medium)


                    
                      CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

4.0 (Medium)


                    
                      CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:L

N/A (UNKNOWN)

low

References

URL

Type

	https://ubuntu.com/security/CVE-2016-4955	REPORT
	http://support.ntp.org/bin/view/Main/SecurityNoti…	REPORT
	https://ubuntu.com/security/notices/USN-3096-1	ADVISORY
	https://www.cve.org/CVERecord?id=CVE-2016-4955	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "ntp",
            "binary_version": "1:4.2.6.p5+dfsg-3ubuntu2.14.04.10"
          },
          {
            "binary_name": "ntpdate",
            "binary_version": "1:4.2.6.p5+dfsg-3ubuntu2.14.04.10"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:14.04:LTS",
        "name": "ntp",
        "purl": "pkg:deb/ubuntu/ntp@1:4.2.6.p5+dfsg-3ubuntu2.14.04.10?arch=source\u0026distro=trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:4.2.6.p5+dfsg-3ubuntu2.14.04.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:4.2.6.p5+dfsg-3ubuntu2",
        "1:4.2.6.p5+dfsg-3ubuntu2.14.04.1",
        "1:4.2.6.p5+dfsg-3ubuntu2.14.04.2",
        "1:4.2.6.p5+dfsg-3ubuntu2.14.04.3",
        "1:4.2.6.p5+dfsg-3ubuntu2.14.04.5",
        "1:4.2.6.p5+dfsg-3ubuntu2.14.04.6",
        "1:4.2.6.p5+dfsg-3ubuntu2.14.04.7",
        "1:4.2.6.p5+dfsg-3ubuntu2.14.04.8"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "ntp",
            "binary_version": "1:4.2.8p4+dfsg-3ubuntu5.3"
          },
          {
            "binary_name": "ntpdate",
            "binary_version": "1:4.2.8p4+dfsg-3ubuntu5.3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "ntp",
        "purl": "pkg:deb/ubuntu/ntp@1:4.2.8p4+dfsg-3ubuntu5.3?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:4.2.8p4+dfsg-3ubuntu5.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "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"
      ]
    }
  ],
  "aliases": [],
  "details": "ntpd in NTP 4.x before 4.2.8p8, when autokey is enabled, allows remote attackers to cause a denial of service (peer-variable clearing and association outage) by sending (1) a spoofed crypto-NAK packet or (2) a packet with an incorrect MAC value at a certain time.",
  "id": "UBUNTU-CVE-2016-4955",
  "modified": "2025-09-08T16:43:46Z",
  "published": "2016-07-04T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2016-4955"
    },
    {
      "type": "REPORT",
      "url": "http://support.ntp.org/bin/view/Main/SecurityNotice#June_2016_ntp_4_2_8p8_NTP_Securi"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-3096-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2016-4955"
    }
  ],
  "related": [
    "USN-3096-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "low",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2016-4955"
  ]
}

VDE-2022-032

Vulnerability from csaf_aumariestergmbhcokg - Published: 2022-08-09 08:00 - Updated: 2022-08-09 08:00

Summary

AUMA: Multiple Vulnerabilities in Automation Runtime NTP Service

Scope

73 vulnerabilities in this advisory, including CVE-2016-4955.

CVE-2016-4955

5.9 (Medium)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Fixed: 1 product Known affected: 1 product

Open the full advisory

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2016-4955 (GCVE-0-2016-4955)

SUSE-SU-2016:1563-1

SUSE-SU-2016:1568-1

SUSE-SU-2016:1584-1

SUSE-SU-2016:1602-1

ubuntu-cve-2016-4955

Vulnerability from osv_ubuntu

VDE-2022-032

Tags

Sightings

Nomenclature