{"id":"CVE-2016-4957","aliases":["DEBIAN-CVE-2016-4957","EUVD-2016-5931","GHSA-3mq4-x52h-fcwc","SUSE-SU-2016:1563-1","SUSE-SU-2016:1568-1","SUSE-SU-2016:1584-1","SUSE-SU-2016:1602-1","openSUSE-SU-2024:10181-1"],"status":"published","title":"ntpd in NTP before 4.2.8p8 allows remote attackers to cause a denial of service (daemon crash)...","description":"ntpd in NTP before 4.2.8p8 allows remote attackers to cause a denial of service (daemon crash) via a crypto-NAK packet.  NOTE: this vulnerability exists because of an incorrect fix for CVE-2016-1547.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.44936,"percentile":0.98785,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-476"],"published":"2016-06-13T12:31:29Z","modified":"2026-08-04T06:04:47Z","fixes":[{"ecosystem":"Debian:11","package":"ntp","fixed_in":["1:4.2.8p8+dfsg-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:11","package":"ntp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:4.2.8p8+dfsg-1"}]}]},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Desktop 12 SP1","package":"ntp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.2.8p8-14.1"}]}],"bundled":5},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server 12 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SP2-LTSS","package":"ntp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.2.8p8-47.3"}]}],"bundled":5},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server 11 SP3-LTSS","package":"ntp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.2.8p8-47.3"}]}],"bundled":5},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server 11 SP3-TERADATA","package":"ntp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.2.8p8-47.3"}]}],"bundled":5},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"ntp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.2.8p9-1.1"}]}],"bundled":60}],"products":[{"vendor":"novell","product":"suse_manager"},{"vendor":"ntp","product":"ntp"},{"vendor":"opensuse","product":"leap"},{"vendor":"opensuse","product":"opensuse"},{"vendor":"oracle","product":"solaris"},{"vendor":"suse","product":"linux_enterprise_desktop"},{"vendor":"suse","product":"linux_enterprise_server"},{"vendor":"suse","product":"manager_proxy"},{"vendor":"suse","product":"openstack_cloud"}],"references":[{"url":"http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00028.html","tags":["vendor-advisory","x_refsource_SUSE","x_transferred","Mailing List","Third Party Advisory","advisory"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00023.html","tags":["vendor-advisory","x_refsource_SUSE","x_transferred","Mailing List","Third Party Advisory","advisory"]},{"url":"https://security.FreeBSD.org/advisories/FreeBSD-SA-16:24.ntp.asc","tags":["vendor-advisory","x_refsource_FREEBSD","x_transferred","Third Party Advisory","advisory"]},{"url":"http://bugs.ntp.org/3046","tags":["x_refsource_CONFIRM","x_transferred","Issue Tracking","Vendor Advisory","report"]},{"url":"http://www.securitytracker.com/id/1036037","tags":["vdb-entry","x_refsource_SECTRACK","x_transferred","Third Party Advisory","VDB Entry","advisory"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00024.html","tags":["vendor-advisory","x_refsource_SUSE","x_transferred","Mailing List","Third Party Advisory","advisory"]},{"url":"http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory","advisory"]},{"url":"http://www.kb.cert.org/vuls/id/321640","tags":["third-party-advisory","x_refsource_CERT-VN","x_transferred","Third Party Advisory","US Government Resource","advisory"]},{"url":"http://support.ntp.org/bin/view/Main/SecurityNotice","tags":["x_refsource_CONFIRM","x_transferred","Release Notes","Vendor Advisory","advisory"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00040.html","tags":["vendor-advisory","x_refsource_SUSE","x_transferred","Mailing List","Third Party Advisory","advisory"]},{"url":"http://support.ntp.org/bin/view/Main/NtpBug3046","tags":["x_refsource_CONFIRM","x_transferred","Patch","Vendor Advisory","fix"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00018.html","tags":["vendor-advisory","x_refsource_SUSE","x_transferred","Mailing List","Third Party Advisory","advisory"]},{"url":"https://security.gentoo.org/glsa/201607-15","tags":["vendor-advisory","x_refsource_GENTOO","x_transferred","Third Party Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2016-4957"},{"url":"https://github.com/advisories/GHSA-3mq4-x52h-fcwc"},{"url":"https://security-tracker.debian.org/tracker/CVE-2016-4957","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2016/suse-su-20161563-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/979302","tags":["report"]},{"url":"https://bugzilla.suse.com/979981","tags":["report"]},{"url":"https://bugzilla.suse.com/981422","tags":["report"]},{"url":"https://bugzilla.suse.com/982056","tags":["report"]},{"url":"https://bugzilla.suse.com/982064","tags":["report"]},{"url":"https://bugzilla.suse.com/982065","tags":["report"]},{"url":"https://bugzilla.suse.com/982066","tags":["report"]},{"url":"https://bugzilla.suse.com/982067","tags":["report"]},{"url":"https://bugzilla.suse.com/982068","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2016-4953","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-4954","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-4955","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-4956","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-4957","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2016/suse-su-20161568-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/957226","tags":["report"]},{"url":"https://bugzilla.suse.com/962960","tags":["report"]},{"url":"https://bugzilla.suse.com/977450","tags":["report"]},{"url":"https://bugzilla.suse.com/977451","tags":["report"]},{"url":"https://bugzilla.suse.com/977452","tags":["report"]},{"url":"https://bugzilla.suse.com/977455","tags":["report"]},{"url":"https://bugzilla.suse.com/977457","tags":["report"]},{"url":"https://bugzilla.suse.com/977458","tags":["report"]},{"url":"https://bugzilla.suse.com/977459","tags":["report"]},{"url":"https://bugzilla.suse.com/977461","tags":["report"]},{"url":"https://bugzilla.suse.com/977464","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2015-7704","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-7705","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-7974","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-1547","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-1548","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-1549","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-1550","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-1551","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-2516","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-2517","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-2518","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-2519","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2016/suse-su-20161584-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2016/suse-su-20161602-1/","tags":["advisory"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2009-0159","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2009-1252","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2013-5211","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2014-9293","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2014-9294","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2014-9295","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2014-9296","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2014-9297","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2014-9298","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-1798","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-1799","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-5300","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-7691","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-7692","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-7701","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-7702","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-7703","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-7848","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-7849","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-7850","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-7851","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-7852","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-7853","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-7854","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-7855","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-7871","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-7973","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-7975","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-7976","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-7977","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-7978","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-7979","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-8138","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-8158","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-7426","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-7427","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-7428","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-7429","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-7431","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-7433","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-7434","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-9310","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-9311","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2016-4957","description":"ntpd in NTP before 4.2.8p8 allows remote attackers to cause a denial of service (daemon crash) via a crypto-NAK packet.  NOTE: this vulnerability exists because of an incorrect fix for CVE-2016-1547.","status":"published","published":"2016-07-05T01:00:00Z","modified":"2024-08-06T00:46:40.165Z","updated_at":"2026-11-02T14:33:34.815789Z"}],"euvd":[{"id":"EUVD-2016-5931","description":"ntpd in NTP before 4.2.8p8 allows remote attackers to cause a denial of service (daemon crash) via a crypto-NAK packet.  NOTE: this vulnerability exists because of an incorrect fix for CVE-2016-1547.","status":"published","published":"2016-07-05T01:00:00Z","modified":"2024-08-06T00:46:40Z","updated_at":"2026-11-03T02:22:44.489595Z"}],"ghsa":[{"id":"GHSA-3mq4-x52h-fcwc","title":"ntpd in NTP before 4.2.8p8 allows remote attackers to cause a denial of service (daemon crash)...","description":"ntpd in NTP before 4.2.8p8 allows remote attackers to cause a denial of service (daemon crash) via a crypto-NAK packet.  NOTE: this vulnerability exists because of an incorrect fix for CVE-2016-1547.","status":"published","published":"2022-05-13T01:25:43Z","modified":"2023-02-01T05:07:17Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T14:50:31.141675Z"}],"nvd":[{"id":"CVE-2016-4957","description":"ntpd in NTP before 4.2.8p8 allows remote attackers to cause a denial of service (daemon crash) via a crypto-NAK packet.  NOTE: this vulnerability exists because of an incorrect fix for CVE-2016-1547.","status":"published","published":"2016-07-05T01:59:04.283Z","modified":"2026-06-17T00:48:30.253Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T14:03:27.736698Z"}],"osv":[{"id":"CVE-2016-4957","description":"ntpd in NTP before 4.2.8p8 allows remote attackers to cause a denial of service (daemon crash) via a crypto-NAK packet.  NOTE: this vulnerability exists because of an incorrect fix for CVE-2016-1547.","status":"published","published":"2016-07-05T01:59:04.283Z","modified":"2026-03-15T22:22:20.884389Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:02.454775Z"},{"id":"DEBIAN-CVE-2016-4957","description":"ntpd in NTP before 4.2.8p8 allows remote attackers to cause a denial of service (daemon crash) via a crypto-NAK packet.  NOTE: this vulnerability exists because of an incorrect fix for CVE-2016-1547.","status":"published","published":"2016-07-05T01:59:04.283Z","modified":"2026-08-04T06:04:47.32345972Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:27.627285Z"},{"id":"openSUSE-SU-2024:10181-1","title":"ntp-4.2.8p9-1.1 on GA media","description":"These are all security issues fixed in the ntp-4.2.8p9-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-15T00:00:00Z","modified":"2026-02-04T03:21:26.696395Z","updated_at":"2026-11-02T16:58:33.135986Z"},{"id":"SUSE-SU-2016:1563-1","title":"Security update for ntp","description":"ntp was updated to version 4.2.8p8 to fix five security issues.\n\nThese security issues were fixed:\n- CVE-2016-4953: Bad authentication demobilizes ephemeral associations (bsc#982065).\n- CVE-2016-4954: Processing spoofed server packets (bsc#982066).\n- CVE-2016-4955: Autokey association reset (bsc#982067).\n- CVE-2016-4956: Broadcast interleave (bsc#982068).\n- CVE-2016-4957: CRYPTO_NAK crash (bsc#982064).\n\nThese non-security issues were fixed:\n- Keep the parent process alive until the daemon has finished initialisation, to make sure that the PID file exists when the parent returns.\n- bsc#979302: Change the process name of the forking DNS worker process to avoid the impression that ntpd is started twice.\n- bsc#981422: Don't ignore SIGCHILD because it breaks wait().\n- bsc#979981: ntp-wait does not accept fractional seconds, so use 1 instead of 0.2 in ntp-wait.service.\n- Separate the creation of ntp.keys and key #1 in it to avoid problems when upgrading installations that have the file, but no key #1, which is needed e.g. by 'rcntp addserver'.\n","status":"published","published":"2016-06-13T12:31:29Z","modified":"2026-02-04T04:01:46.333478Z","updated_at":"2026-11-02T15:53:43.438985Z"},{"id":"SUSE-SU-2016:1568-1","title":"Security update for ntp","description":"ntp was updated to version 4.2.8p8 to fix 17 security issues.\n\nThese security issues were fixed:\n- CVE-2016-4956: Broadcast interleave (bsc#982068).\n- CVE-2016-2518: Crafted addpeer with hmode \u003e 7 causes array wraparound with MATCH_ASSOC (bsc#977457).\n- CVE-2016-2519: ctl_getitem() return value not always checked (bsc#977458).\n- CVE-2016-4954: Processing spoofed server packets (bsc#982066).\n- CVE-2016-4955: Autokey association reset (bsc#982067).\n- CVE-2015-7974: NTP did not verify peer associations of symmetric keys when authenticating packets, which might allowed remote attackers to conduct impersonation attacks via an arbitrary trusted key, aka a 'skeleton key (bsc#962960).\n- CVE-2016-4957: CRYPTO_NAK crash (bsc#982064).\n- CVE-2016-2516: Duplicate IPs on unconfig directives will cause an assertion botch (bsc#977452).\n- CVE-2016-2517: Remote configuration trustedkey/requestkey values are not properly validated (bsc#977455).\n- CVE-2016-4953: Bad authentication demobilizes ephemeral associations (bsc#982065).\n- CVE-2016-1547: CRYPTO-NAK DoS (bsc#977459).\n- CVE-2016-1551: Refclock impersonation vulnerability, AKA: refclock-peering (bsc#977450).\n- CVE-2016-1550: Improve NTP security against buffer comparison timing attacks, authdecrypt-timing, AKA: authdecrypt-timing (bsc#977464).\n- CVE-2016-1548: Interleave-pivot - MITIGATION ONLY (bsc#977461).\n- CVE-2016-1549: Sybil vulnerability: ephemeral association attack, AKA: ntp-sybil - MITIGATION ONLY (bsc#977451).\n\nThis release also contained improved patches for CVE-2015-7704, CVE-2015-7705, CVE-2015-7974.\n\nThese non-security issues were fixed:\n- bsc#979302: Change the process name of the forking DNS worker process to avoid the impression that ntpd is started twice.\n- bsc#981422: Don't ignore SIGCHILD because it breaks wait().\n- bsc#979981: ntp-wait does not accept fractional seconds, so use 1 instead of 0.2 in ntp-wait.service.\n- Separate the creation of ntp.keys and key #1 in it to avoid problems when upgrading installations that have the file, but no key #1, which is needed e.g. by 'rcntp addserver'.\n- bsc#957226: Restrict the parser in the startup script to the first occurrance of 'keys' and 'controlkey' in ntp.conf.\n  ","status":"published","published":"2016-06-14T06:45:46Z","modified":"2026-02-04T02:54:59.789302Z","updated_at":"2026-11-02T15:53:43.438985Z"},{"id":"SUSE-SU-2016:1584-1","title":"Security update for ntp","description":"ntp was updated to version 4.2.8p8 to fix five security issues.\n\nThese security issues were fixed:\n- CVE-2016-4953: Bad authentication demobilizes ephemeral associations (bsc#982065).\n- CVE-2016-4954: Processing spoofed server packets (bsc#982066).\n- CVE-2016-4955: Autokey association reset (bsc#982067).\n- CVE-2016-4956: Broadcast interleave (bsc#982068).\n- CVE-2016-4957: CRYPTO_NAK crash (bsc#982064).\n\nThese non-security issues were fixed:\n- Keep the parent process alive until the daemon has finished initialisation, to make sure that the PID file exists when the parent returns.\n- bsc#979302: Change the process name of the forking DNS worker process to avoid the impression that ntpd is started twice.\n- bsc#981422: Don't ignore SIGCHILD because it breaks wait().\n- Separate the creation of ntp.keys and key #1 in it to avoid problems when upgrading installations that have the file, but no key #1, which is needed e.g. by 'rcntp addserver'.\n","status":"published","published":"2016-06-15T08:36:41Z","modified":"2026-02-04T04:15:45.24985Z","updated_at":"2026-11-02T15:53:43.438985Z"},{"id":"SUSE-SU-2016:1602-1","title":"Security update for ntp","description":"ntp was updated to version 4.2.8p8 to fix five security issues.\n\nThese security issues were fixed:\n- CVE-2016-4953: Bad authentication demobilizes ephemeral associations (bsc#982065).\n- CVE-2016-4954: Processing spoofed server packets (bsc#982066).\n- CVE-2016-4955: Autokey association reset (bsc#982067).\n- CVE-2016-4956: Broadcast interleave (bsc#982068).\n- CVE-2016-4957: CRYPTO_NAK crash (bsc#982064).\n\nThese non-security issues were fixed:\n- Keep the parent process alive until the daemon has finished initialisation, to make sure that the PID file exists when the parent returns.\n- bsc#979302: Change the process name of the forking DNS worker process to avoid the impression that ntpd is started twice.\n- bsc#981422: Don't ignore SIGCHILD because it breaks wait().\n","status":"published","published":"2016-06-17T09:07:40Z","modified":"2026-02-04T04:37:51.633678Z","updated_at":"2026-11-02T15:53:43.438985Z"}]}}