CVE-2016-4956

EPSS 1.40% · P81 Updated Feb 21, 2026

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I. Basic Information for CVE-2016-4956

Vulnerability Information

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Vulnerability Title

N/A

Source: NVD (National Vulnerability Database)

Vulnerability Description

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.

Source: NVD (National Vulnerability Database)

CVSS Information

N/A

Source: NVD (National Vulnerability Database)

Vulnerability Type

N/A

Source: NVD (National Vulnerability Database)

Vulnerability Title

NTP ntpd 拒绝服务漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

ntpd（Network Time Protocol daemon）是一个操作系统守护进程，它使用网络时间协议（NTP）与时间服务器的系统时间保持同步。 NTP 4.2.8p8之前4.x版本的ntpd中存在安全漏洞。远程攻击者可通过发送伪造的广播数据包利用该漏洞拒绝服（interleaved-mode转换和时间更改）。（注：该漏洞由于CNNVD-201604-603补丁的不完全修复存在）

Source: CNNVD (China National Vulnerability Database)

CVSS Information

N/A

Source: CNNVD (China National Vulnerability Database)

Vulnerability Type

N/A

Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
-	n/a	n/a	-

II. Public POCs for CVE-2016-4956

#	POC Description	Source Link	Shenlong Link

AI-Generated POCPremium

No public POC found.

III. Intelligence Information for CVE-2016-4956

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https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03757en_usx_refsource_CONFIRM
http://bugs.ntp.org/3042x_refsource_CONFIRM
https://us-cert.cisa.gov/ics/advisories/icsa-21-159-11x_refsource_MISC
http://support.ntp.org/bin/view/Main/NtpBug3042x_refsource_CONFIRM
SSA-211752 V1.1 (Last Update: 2022-02-08): Multiple NTP-Client Related Vulnerabilities in SIMATIC CP 443-1 OPC UAx_refsource_CONFIRM
http://packetstormsecurity.com/files/137321/Slackware-Security-Advisory-ntp-Updates.htmlx_refsource_MISC
http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.htmlx_refsource_CONFIRM
http://www.securityfocus.com/bid/91009vdb-entryx_refsource_BID
http://www.securitytracker.com/id/1036037vdb-entryx_refsource_SECTRACK
http://www.kb.cert.org/vuls/id/321640third-party-advisoryx_refsource_CERT-VN
https://www.kb.cert.org/vuls/id/321640third-party-advisoryx_refsource_CERT-VN
http://www.ubuntu.com/usn/USN-3096-1vendor-advisoryx_refsource_UBUNTU
https://security.gentoo.org/glsa/201607-15vendor-advisoryx_refsource_GENTOO
https://security.FreeBSD.org/advisories/FreeBSD-SA-16:24.ntp.ascvendor-advisoryx_refsource_FREEBSD
http://lists.opensuse.org/opensuse-security-announce/2016-07/msg00026.htmlvendor-advisoryx_refsource_SUSE
http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00020.htmlvendor-advisoryx_refsource_SUSE
http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00024.htmlvendor-advisoryx_refsource_SUSE
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00042.htmlvendor-advisoryx_refsource_SUSE
http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00028.htmlvendor-advisoryx_refsource_SUSE
http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00018.htmlvendor-advisoryx_refsource_SUSE
http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00040.htmlvendor-advisoryx_refsource_SUSE
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WNWGCQLW2VY72NIUYMJOCAKJKTXHDUK2/vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ORAMN3Q7TVJ54MBYF75XCJOE3DP7LYHT/vendor-advisoryx_refsource_FEDORA
http://www.securityfocus.com/archive/1/archive/1/538599/100/0/threadedmailing-listx_refsource_BUGTRAQ
http://www.securityfocus.com/archive/1/538599/100/0/threadedmailing-listx_refsource_BUGTRAQ
http://www.securityfocus.com/archive/1/538600/100/0/threadedmailing-listx_refsource_BUGTRAQ
http://www.securityfocus.com/archive/1/archive/1/538600/100/0/threadedmailing-listx_refsource_BUGTRAQ
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160603-ntpdvendor-advisoryx_refsource_CISCO
http://www.securityfocus.com/archive/1/540683/100/0/threadedmailing-listx_refsource_BUGTRAQ
http://www.securityfocus.com/archive/1/archive/1/540683/100/0/threadedmailing-listx_refsource_BUGTRAQ
https://nvd.nist.gov/vuln/detail/CVE-2016-4956

Same Patch Batch · n/a · 2016-07-05 · 8 CVEs total

CVE-2016-4953		NTP ntpd 拒绝服务漏洞
CVE-2016-4954		NTP ntpd 拒绝服务漏洞
CVE-2016-4955		NTP ntpd 拒绝服务漏洞
CVE-2016-4957		NTP.org ntpd 拒绝服务漏洞
CVE-2016-5097		phpMyAdmin 安全漏洞
CVE-2016-5098		phpMyAdmin 目录遍历漏洞
CVE-2016-5099		phpMyAdmin 跨站脚本漏洞

IV. Related Vulnerabilities

Same product: n/a

Same vendor: n/a

V. Comments for CVE-2016-4956

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CVE-2016-4956

I. Basic Information for CVE-2016-4956

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Affected Products

II. Public POCs for CVE-2016-4956

III. Intelligence Information for CVE-2016-4956

Same Patch Batch · n/a · 2016-07-05 · 8 CVEs total

IV. Related Vulnerabilities

V. Comments for CVE-2016-4956

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