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.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 44.9%, higher than 99% of all known CVEs. Patch or mitigate before the next change window.
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 44.94% probability · 99th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-476
- Affected
- ntp/ntp · oracle/solaris · suse/manager proxy · suse/openstack cloud · novell/suse manager · opensuse/leap · opensuse/opensuse · suse/linux enterprise desktop · suse/linux enterprise server
- Source
- cve@mitre.org
EPSS 44.9% since 4 November 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://bugs.ntp.org/3046Issue Tracking, Vendor Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00018.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00023.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00024.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00028.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00040.htmlMailing List, Third Party Advisory
- http://support.ntp.org/bin/view/Main/NtpBug3046Patch, Vendor Advisory
- http://support.ntp.org/bin/view/Main/SecurityNoticeRelease Notes, Vendor Advisory
- http://www.kb.cert.org/vuls/id/321640Third Party Advisory, US Government Resource
- http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.htmlThird Party Advisory
- http://www.securitytracker.com/id/1036037Third Party Advisory, VDB Entry
- https://security.FreeBSD.org/advisories/FreeBSD-SA-16:24.ntp.ascThird Party Advisory
- https://security.gentoo.org/glsa/201607-15Third Party Advisory
- http://bugs.ntp.org/3046Issue Tracking, Vendor Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00018.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00023.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00024.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00028.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00040.htmlMailing List, Third Party Advisory
- http://support.ntp.org/bin/view/Main/NtpBug3046Patch, Vendor Advisory
- http://support.ntp.org/bin/view/Main/SecurityNoticeRelease Notes, Vendor Advisory
- http://www.kb.cert.org/vuls/id/321640Third Party Advisory, US Government Resource
- http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.htmlThird Party Advisory
- http://www.securitytracker.com/id/1036037Third Party Advisory, VDB Entry
- https://security.FreeBSD.org/advisories/FreeBSD-SA-16:24.ntp.ascThird Party Advisory
- https://security.gentoo.org/glsa/201607-15Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.