CVE-2016-4954: ntp Race Condition
CVSS: 7.5v3.1HighModified
AliasesUBUNTU-CVE-2016-4954DEBIAN-CVE-2016-4954
Published 05-07-2016Last modified 06-08-2024
Vulnerability summary
CVE-2016-4954 is a high (CVSS 7.5) Race Condition vulnerability in ntp. EPSS estimates a 13.34% chance of exploitation in the next 30 days, higher than 96.3% of scored vulnerabilities.
CVSS score
7.5/10
010
High · v3.1 (NVD)EPSS score
13.34%
0%100%
Medium · +0.13 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 7 · Related 6Timeline
- 05-07-2016PublishedVulnerability first disclosed.
- 06-08-2024Last modifiedVulnerability information updated.
Description
The process_packet function in ntp_proto.c in ntpd in NTP 4.x before 4.2.8p8 allows remote attackers to cause a denial of service (peer-variable modification) by sending spoofed packets from many source IP addresses in a certain scenario, as demonstrated by triggering an incorrect leap indication.
CVSS metrics
5 scores · 3 sources · 3 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 3 agree
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Medium 4.0Preferred score · OSV · Ubuntu (Ecosystem advisory) · calculated from vector
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:LSourcesSingle source
Medium 5.0Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:N/I:N/A:PSourcesSingle source
EPSS trend
Probability
13.34%
Chance of exploitation in the next 30 days
Percentile
96%
Versus all other CVEs
30-day change
+0.13 pp
From 13.21% on 18-09-2026
18-09-202618-10-2026
EPSS score13.34%
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
Ubuntu1 product
- ntp< 1:4.2.6.p5+dfsg-3ubuntu2.14.04.10 | < 1:4.2.8p4+dfsg-3ubuntu5.3
6 vendors · 11 products
References
40 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
Show all 40 references
- www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.htmlX Refsource CONFIRMThird Party Advisory
- 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
