CVE-2016-1547 (GCVE-0-2016-1547)

Vulnerability from cvelistv5 – Published: 2017-01-06 21:00 – Updated: 2024-08-05 23:02
VLAI
Summary
An off-path attacker can cause a preemptible client association to be demobilized in NTP 4.2.8p4 and earlier and NTPSec a5fb34b9cc89b92a8fef2f459004865c93bb7f92 by sending a crypto NAK packet to a victim client with a spoofed source address of an existing associated peer. This is true even if authentication is enabled.
Severity
5.3 (Medium)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CWE
  • unspecified
Assigner
References
Impacted products
Vendor Product Version CPE status
NTP Project NTP Affected: 4.2.8p3
Affected: 4.2.8p4
guessed Create a notification for this product.
NTPsec Project NTPSec Affected: a5fb34b9cc89b92a8fef2f459004865c93bb7f92
guessed Create a notification for this product.
Date Public
2016-04-26 00:00
Show details on NVD website
To clipboard 

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          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "url": "https://us-cert.cisa.gov/ics/advisories/icsa-21-103-11"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "url": "https://www.arista.com/en/support/advisories-notices/security-advisories/1332-security-advisory-19"
        }
      ],
      "sourceIdentifier": "cret@cert.org",
      "vulnStatus": "Modified",
      "weaknesses": [
        {
          "description": [
            {
              "lang": "en",
              "value": "CWE-20"
            }
          ],
          "source": "nvd@nist.gov",
          "type": "Primary"
        }
      ]
    },
    "nvd": {
      "cve": {
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:a:ntp:ntp:*:p4:*:*:*:*:*:*",
                    "matchCriteriaId": "05D076CA-85DD-48B4-9A8A-F413FFBFB55F",
                    "versionEndIncluding": "4.2.8",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "An off-path attacker can cause a preemptible client association to be demobilized in NTP 4.2.8p4 and earlier and NTPSec a5fb34b9cc89b92a8fef2f459004865c93bb7f92 by sending a crypto NAK packet to a victim client with a spoofed source address of an existing associated peer. This is true even if authentication is enabled."
          },
          {
            "lang": "es",
            "value": "Un atacante fuera de ruta puede provocar que una asociaci\u00f3n de clientes preventiva sea desmovilizada en NTP 4.2.8p4 y versiones anteriores y NTPSec a5fb34b9cc89b92a8fef2f459004865c93bb7f92 enviando un paquete NAK encriptado a un cliente v\u00edctima con una direcci\u00f3n fuente suplantada de un asociado existente. Esto es cierto incluso si la autenticaci\u00f3n est\u00e1 habilitada."
          }
        ],
        "id": "CVE-2016-1547",
        "lastModified": "2026-05-06T22:30:45.220",
        "metrics": {
          "cvssMetricV2": [
            {
              "acInsufInfo": false,
              "baseSeverity": "MEDIUM",
              "cvssData": {
                "accessComplexity": "LOW",
                "accessVector": "NETWORK",
                "authentication": "NONE",
                "availabilityImpact": "PARTIAL",
                "baseScore": 5.0,
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
                "version": "2.0"
              },
              "exploitabilityScore": 10.0,
              "impactScore": 2.9,
              "obtainAllPrivilege": false,
              "obtainOtherPrivilege": false,
              "obtainUserPrivilege": false,
              "source": "nvd@nist.gov",
              "type": "Primary",
              "userInteractionRequired": false
            }
          ],
          "cvssMetricV30": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "LOW",
                "baseScore": 5.3,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
                "version": "3.0"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 1.4,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2017-01-06T21:59:00.320",
        "references": [
          {
            "source": "cret@cert.org",
            "url": "http://rhn.redhat.com/errata/RHSA-2016-1552.html"
          },
          {
            "source": "cret@cert.org",
            "url": "http://www.debian.org/security/2016/dsa-3629"
          },
          {
            "source": "cret@cert.org",
            "url": "http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html"
          },
          {
            "source": "cret@cert.org",
            "url": "http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html"
          },
          {
            "source": "cret@cert.org",
            "url": "http://www.securityfocus.com/bid/88276"
          },
          {
            "source": "cret@cert.org",
            "url": "http://www.securitytracker.com/id/1035705"
          },
          {
            "source": "cret@cert.org",
            "tags": [
              "Mitigation",
              "Technical Description",
              "Third Party Advisory"
            ],
            "url": "http://www.talosintelligence.com/reports/TALOS-2016-0081/"
          },
          {
            "source": "cret@cert.org",
            "url": "https://access.redhat.com/errata/RHSA-2016:1141"
          },
          {
            "source": "cret@cert.org",
            "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-211752.pdf"
          },
          {
            "source": "cret@cert.org",
            "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdf"
          },
          {
            "source": "cret@cert.org",
            "url": "https://security.FreeBSD.org/advisories/FreeBSD-SA-16:16.ntp.asc"
          },
          {
            "source": "cret@cert.org",
            "url": "https://security.gentoo.org/glsa/201607-15"
          },
          {
            "source": "cret@cert.org",
            "url": "https://security.netapp.com/advisory/ntap-20171004-0002/"
          },
          {
            "source": "cret@cert.org",
            "url": "https://us-cert.cisa.gov/ics/advisories/icsa-21-103-11"
          },
          {
            "source": "cret@cert.org",
            "url": "https://www.arista.com/en/support/advisories-notices/security-advisories/1332-security-advisory-19"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "http://rhn.redhat.com/errata/RHSA-2016-1552.html"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "http://www.debian.org/security/2016/dsa-3629"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "http://www.securityfocus.com/bid/88276"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "http://www.securitytracker.com/id/1035705"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Mitigation",
              "Technical Description",
              "Third Party Advisory"
            ],
            "url": "http://www.talosintelligence.com/reports/TALOS-2016-0081/"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://access.redhat.com/errata/RHSA-2016:1141"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-211752.pdf"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdf"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://security.FreeBSD.org/advisories/FreeBSD-SA-16:16.ntp.asc"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://security.gentoo.org/glsa/201607-15"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://security.netapp.com/advisory/ntap-20171004-0002/"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://us-cert.cisa.gov/ics/advisories/icsa-21-103-11"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://www.arista.com/en/support/advisories-notices/security-advisories/1332-security-advisory-19"
          }
        ],
        "sourceIdentifier": "cret@cert.org",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-20"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-05-06T22:47:28+00:00",
      "cve": "CVE-2016-1547",
      "id": "CVE-2016-1547",
      "initial_release_date": "2016-04-26T00:00:00+00:00",
      "product_status:fixed": "368",
      "product_status:known_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "ntp: crypto-NAK preemptable association denial of service",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2016/cve-2016-1547.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-01T02:22:00Z",
      "cve": "CVE-2016-1547",
      "id": "CVE-2016-1547",
      "initial_release_date": "2023-02-15T05:08:15Z",
      "product_status:known_affected": "30",
      "product_status:recommended": "112",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2016-1547",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2016-1547.json",
      "version": "16"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.