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{"affected": [{"affectedData": [{"product": "NTP", "vendor": "NTP Project", "versions": [{"status": "affected", "version": "4.2.8p3"}, {"status": "affected", "version": "4.2.8p4"}]}, {"product": "NTPSec", "vendor": "NTPsec Project", "versions": [{"status": "affected", "version": "a5fb34b9cc89b92a8fef2f459004865c93bb7f92"}]}], "source": "cret@cert.org"}], "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": "2026-06-17T00:42:08.537", "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"}]}

{"affected_release": [{"advisory": "RHSA-2016:1141", "cpe": "cpe:/o:redhat:enterprise_linux:6", "package": "ntp-0:4.2.6p5-10.el6.1", "product_name": "Red Hat Enterprise Linux 6", "release_date": "2016-05-31T00:00:00Z"}, {"advisory": "RHSA-2016:1552", "cpe": "cpe:/o:redhat:rhel_eus:6.7", "package": "ntp-0:4.2.6p5-5.el6_7.5", "product_name": "Red Hat Enterprise Linux 6.7 Extended Update Support", "release_date": "2016-08-03T00:00:00Z"}, {"advisory": "RHSA-2016:1141", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "ntp-0:4.2.6p5-22.el7_2.2", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2016-05-31T00:00:00Z"}], "bugzilla": {"description": "ntp: crypto-NAK preemptable association denial of service", "id": "1331461", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1331461"}, "csaw": false, "cvss": {"cvss_base_score": "4.3", "cvss_scoring_vector": "AV:N/AC:M/Au:N/C:N/I:N/A:P", "status": "verified"}, "details": ["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.", "A denial of service flaw was found in the way NTP handled preemptable client associations. A remote attacker could send several crypto NAK packets to a victim client, each with a spoofed source address of an existing associated peer, preventing that client from synchronizing its time."], "name": "CVE-2016-1547", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Will not fix", "package_name": "ntp", "product_name": "Red Hat Enterprise Linux 5"}], "public_date": "2016-04-26T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2016-1547\nhttps://nvd.nist.gov/vuln/detail/CVE-2016-1547\nhttp://support.ntp.org/bin/view/Main/SecurityNotice#April_2016_NTP_4_2_8p7_Security\nhttp://www.talosintel.com/reports/TALOS-2016-0081/"], "threat_severity": "Moderate"}

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