{
    "id": "CVE-2015-7855",
    "published": "2017-08-07 20:29:00",
    "last_modified": "2026-06-17 00:33:16",
    "cvss_score": "6.5",
    "cvss_severity": "MEDIUM",
    "cvss_version": "3.1",
    "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
    "cwe": "CWE-20",
    "description": "The decodenetnum function in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote attackers to cause a denial of service (assertion failure) via a 6 or mode 7 packet containing a long data value.",
    "epss_score": "0.31068",
    "epss_percentile": "0.98210",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 1,
    "updated_at": "2026-09-27 18:17:15",
    "priority": {
        "rank": 2,
        "label": "Patch early",
        "why": "A public exploit exists."
    },
    "products": [
        {
            "vendor": "debian",
            "product": "debian_linux"
        },
        {
            "vendor": "netapp",
            "product": "clustered_data_ontap"
        },
        {
            "vendor": "netapp",
            "product": "data_ontap"
        },
        {
            "vendor": "netapp",
            "product": "oncommand_balance"
        },
        {
            "vendor": "netapp",
            "product": "oncommand_performance_manager"
        },
        {
            "vendor": "netapp",
            "product": "oncommand_unified_manager"
        },
        {
            "vendor": "ntp",
            "product": "ntp"
        },
        {
            "vendor": "siemens",
            "product": "tim_4r-ie"
        },
        {
            "vendor": "siemens",
            "product": "tim_4r-ie_dnp3"
        },
        {
            "vendor": "siemens",
            "product": "tim_4r-ie_dnp3_firmware"
        },
        {
            "vendor": "siemens",
            "product": "tim_4r-ie_firmware"
        }
    ],
    "kev_detail": null,
    "exploits": [
        {
            "source": "exploit-db",
            "ref_id": "40840",
            "title": "NTP 4.2.8p3 - Denial of Service",
            "date": "2016-11-28",
            "url": "https://www.exploit-db.com/exploits/40840"
        }
    ],
    "refs_list": [
        "http://support.ntp.org/bin/view/Main/NtpBug2922",
        "http://www.debian.org/security/2015/dsa-3388",
        "http://www.securityfocus.com/bid/77283",
        "http://www.securitytracker.com/id/1033951",
        "https://bugzilla.redhat.com/show_bug.cgi?id=1274264",
        "https://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdf",
        "https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05270839",
        "https://security.gentoo.org/glsa/201607-15",
        "https://security.netapp.com/advisory/ntap-20171004-0001/",
        "https://us-cert.cisa.gov/ics/advisories/icsa-21-103-11",
        "https://www.exploit-db.com/exploits/40840/",
        "http://support.ntp.org/bin/view/Main/NtpBug2922",
        "http://www.debian.org/security/2015/dsa-3388",
        "http://www.securityfocus.com/bid/77283",
        "http://www.securitytracker.com/id/1033951",
        "https://bugzilla.redhat.com/show_bug.cgi?id=1274264",
        "https://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdf",
        "https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05270839",
        "https://security.gentoo.org/glsa/201607-15",
        "https://security.netapp.com/advisory/ntap-20171004-0001/",
        "https://us-cert.cisa.gov/ics/advisories/icsa-21-103-11",
        "https://www.exploit-db.com/exploits/40840/"
    ]
}