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{"acknowledgement": "This issue was discovered by Miroslav Lichvar (Red Hat).", "bugzilla": {"description": "ntp: broadcast interleave (incomplete fix for CVE-2016-1548)", "id": "1340860", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1340860"}, "csaw": false, "cvss": {"cvss_base_score": "2.6", "cvss_scoring_vector": "AV:N/AC:H/Au:N/C:N/I:N/A:P", "status": "draft"}, "details": ["ntpd in NTP 4.x before 4.2.8p8 allows remote attackers to cause a denial of service (interleaved-mode transition and time change) via a spoofed broadcast packet. NOTE: this vulnerability exists because of an incomplete fix for CVE-2016-1548."], "mitigation": {"lang": "en:us", "value": "Do not use NTP's broadcast mode in the clients by not configuring the \"broadcastclient\" directive in the ntp.conf file."}, "name": "CVE-2016-4956", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Will not fix", "package_name": "ntp", "product_name": "Red Hat Enterprise Linux 5"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Will not fix", "package_name": "ntp", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Will not fix", "package_name": "ntp", "product_name": "Red Hat Enterprise Linux 7"}], "public_date": "2016-06-02T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2016-4956\nhttps://nvd.nist.gov/vuln/detail/CVE-2016-4956\nhttp://support.ntp.org/bin/view/Main/SecurityNotice#June_2016_ntp_4_2_8p8_NTP_Securi"], "threat_severity": "Low", "upstream_fix": "ntp 4.2.8p8"}