CVE-2016-4953: ntp Improper Authentication
CVSS: 7.5v3.1HighModified
AliasesDEBIAN-CVE-2016-4953
Published 05-07-2016Last modified 06-08-2024
Vulnerability summary
CVE-2016-4953 is a high (CVSS 7.5) Improper Authentication vulnerability in ntp. EPSS estimates a 17.24% chance of exploitation in the next 30 days, higher than 97% of scored vulnerabilities.
CVSS score
7.5/10
010
High · v3.1 (NVD)EPSS score
17.24%
0%100%
Medium · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 5 · Related 5Timeline
- 05-07-2016PublishedVulnerability first disclosed.
- 06-08-2024Last modifiedVulnerability information updated.
Description
ntpd in NTP 4.x before 4.2.8p8 allows remote attackers to cause a denial of service (ephemeral-association demobilization) by sending a spoofed crypto-NAK packet with incorrect authentication data at a certain time.
CVSS metrics
3 scores · 2 sources · 2 versionsHigh 7.5Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HSourcesAll 2 agree
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Medium 5.0Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:N/I:N/A:PSourcesSingle source
EPSS trend
Probability
17.24%
Chance of exploitation in the next 30 days
Percentile
97%
Versus all other CVEs
30-day change
0.00 pp
From 17.24% on 18-09-2026
18-09-202618-10-2026
EPSS score17.24%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Suse5 products
- linux_enterprise_desktop12:sp1
- linux_enterprise_server11:sp2 | 11:sp3 | 11:sp4 | 12:sp1
- manager2.1
- manager_proxy2.1
- openstack_cloud5
Debian1 product
- ntp< 1:4.2.8p8+dfsg-1
Ntp1 product
- ntp≥ 4.2.0, < 4.2.8 | ≥ 4.3.0, < 4.3.93 | 4.2.8 | 4.2.8:p1 | 4.2.8:p1-beta1 | 4.2.8:p1-beta2 | 4.2.8:p1-beta3 | 4.2.8:p1-beta4 | 4.2.8:p1-beta5 | 4.2.8:p1-rc1 | 4.2.8:p1-rc2 | 4.2.8:p2 | 4.2.8:p2-rc1 | 4.2.8:p2-rc2 | 4.2.8:p2-rc3 | 4.2.8:p3 | 4.2.8:p3-rc1 | 4.2.8:p3-rc2 | 4.2.8:p3-rc3 | 4.2.8:p4 | 4.2.8:p5 | 4.2.8:p6 | 4.2.8:p7
Oracle1 product
- solarisEOL10 | 11.3
5 vendors · 10 products
References
33 links- lists.opensuse.org/opensuse-security-announce/2016-06/msg00028.htmlVendor AdvisoryX Refsource SUSEMailing ListThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2016-06/msg00023.htmlVendor AdvisoryX Refsource SUSEMailing ListThird Party Advisory
- security.freebsd.org/advisories/FreeBSD-SA-16:24.ntp.ascVendor AdvisoryX Refsource FREEBSDThird Party Advisory
- h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03757en_usX Refsource CONFIRMThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2016-06/msg00024.htmlVendor AdvisoryX Refsource SUSEMailing ListThird Party Advisory
- www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.htmlX Refsource CONFIRMThird Party Advisory
Show all 33 references
- lists.opensuse.org/opensuse-security-announce/2016-06/msg00040.htmlVendor AdvisoryX Refsource SUSEMailing ListThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2016-06/msg00018.htmlVendor AdvisoryX Refsource SUSEMailing ListThird Party Advisory
- tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160603-ntpdVendor AdvisoryX Refsource CISCO
us-cert.cisa.gov/ics/advisories/icsa-21-103-11X Refsource CONFIRMThird Party AdvisoryUS Government Resource- us-cert.cisa.gov/ics/advisories/icsa-21-159-11X Refsource MISC
