01 Record

CVE-2016-4957

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.

UnratedPUBLISHEDCNA: mitre

CNA base scoreUnratedNo CNA CVSS vector

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02 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.

03 Exploitation and scoring

Exploitation: Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision: Not assessed by CISA
EPSS probability: 44.93% probability of exploitation activity in the next 30 days.
EPSS percentile: Equal to or higher than the score of 98.6% of scored records. A rank, not a probability.
NVD base score: 7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD analysis status: Modified. NVD last modified this record on 2026-06-17.
Red Hat severity: Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2016-07-05 01:00Z10 YR AGO

Last updated

2024-08-06 00:46Z2 YR AGO

Reserved

2016-05-23

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

CWE-476NULL Pointer DereferenceBase

Data version

5.1

Document digest

424eee6f6eea16b149a7764b1116c3bfe0ca91820f0a218d4d1cdc53e126953e

05 Affected products

VendorProductVersionsPlatforms

novellsuse_managerNot specified—

ntpntpNot specified—

opensuseleapNot specified—

opensuseopensuseNot specified—

oraclesolarisNot specified—

redhatenterprise_linuxNot specified—

suselinux_enterprise_desktopNot specified—

suselinux_enterprise_serverNot specified—

susemanager_proxyNot specified—

suseopenstack_cloudNot specified—

06 References

lists.opensuse.orgSUSE-SU-2016:1602http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00028.htmlvendor-advisoryx_refsource_SUSE
lists.opensuse.orgopenSUSE-SU-2016:1583http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00023.htmlvendor-advisoryx_refsource_SUSE
security.freebsd.orgFreeBSD-SA-16:24https://security.FreeBSD.org/advisories/FreeBSD-SA-16:24.ntp.ascvendor-advisoryx_refsource_FREEBSD
bugs.ntp.orghttp://bugs.ntp.org/3046x_refsource_CONFIRM
www.securitytracker.com1036037http://www.securitytracker.com/id/1036037vdb-entryx_refsource_SECTRACK
lists.opensuse.orgSUSE-SU-2016:1584http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00024.htmlvendor-advisoryx_refsource_SUSE
www.oracle.comhttp://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.htmlx_refsource_CONFIRM
www.kb.cert.orgVU#321640http://www.kb.cert.org/vuls/id/321640third-party-advisoryx_refsource_CERT-VN
support.ntp.orghttp://support.ntp.org/bin/view/Main/SecurityNoticex_refsource_CONFIRM
lists.opensuse.orgopenSUSE-SU-2016:1636http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00040.htmlvendor-advisoryx_refsource_SUSE
support.ntp.orghttp://support.ntp.org/bin/view/Main/NtpBug3046x_refsource_CONFIRM
lists.opensuse.orgSUSE-SU-2016:1563http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00018.htmlvendor-advisoryx_refsource_SUSE
security.gentoo.orgGLSA-201607-15https://security.gentoo.org/glsa/201607-15vendor-advisoryx_refsource_GENTOO

07 Fixed in

Debian 11

ntp
Fixed in 1:4.2.8p8+dfsg-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.