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CVE-2016-4954

31
FAUCET Score

CVE-2016-4954 describes a denial-of-service vulnerability in NTP 4.x before 4.2.8p8, affecting products like ntp, opensuse, and Oracle. This high-severity flaw (CVSS 7.5) allows remote, unauthenticated attackers to cause a denial of service by sending spoofed packets, leading to incorrect leap indications. While no public exploit code or active exploitation is reported, it has garnered some community discussion and media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
>= 4.2.0, < 4.2.8CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:*:*:*:*:*:*:*:*
>= 4.3.0, < 4.3.93CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:*:*:*:*:*:*:*:*
4.2.8CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:4.2.8:-:*:*:*:*:*:*
4.2.8CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:4.2.8:p1:*:*:*:*:*:*
4.2.8CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:4.2.8:p1-beta1:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
13.21%
Probability of exploitation in next 30 days
EPSS Percentile
96.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.1321 is in the 94th percentile among its peer group of 51,466 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (3)

redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: ntp
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: ntp
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: ntp

Vendor Advisories (1)

redhatCVE-2016-4954Moderate

ntp: partial processing of spoofed packets

Jun 2, 2016

References

bugs.ntp.org / 3044
Issue TrackingVendor Advisory
lists.opensuse.org / opensuse-security-announce/2016-06/msg00018.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-security-announce/2016-06/msg00020.html
lists.opensuse.org / opensuse-security-announce/2016-06/msg00023.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-security-announce/2016-06/msg00024.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-security-announce/2016-06/msg00028.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-security-announce/2016-06/msg00040.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-security-announce/2016-07/msg00026.html
lists.opensuse.org / opensuse-security-announce/2016-08/msg00042.html
packetstormsecurity.com / files/137321/Slackware-Security-Advisory-ntp-Updates.html
packetstormsecurity.com / files/137322/FreeBSD-Security-Advisory-FreeBSD-SA-16-24.ntp.html
cert-portal.siemens.com / productcert/pdf/ssa-211752.pdf
Third Party Advisory
cert-portal.siemens.com / productcert/pdf/ssa-497656.pdf
Third Party Advisory
h20566.www2.hpe.com / hpsc/doc/public/display
Third Party Advisory
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/K3EYJQHJZ2KTVQ7ICEFHXTLZ36MRASWX
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/ORAMN3Q7TVJ54MBYF75XCJOE3DP7LYHT
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/WNWGCQLW2VY72NIUYMJOCAKJKTXHDUK2
security.freebsd.org / advisories/FreeBSD-SA-16:24.ntp.asc
Third Party Advisory
security.gentoo.org / glsa/201607-15
Third Party Advisory
support.ntp.org / bin/view/Main/NtpBug3044
PatchVendor Advisory
support.ntp.org / bin/view/Main/SecurityNotice
Vendor Advisory
us-cert.cisa.gov / ics/advisories/icsa-21-103-11
Third Party AdvisoryUS Government Resource
us-cert.cisa.gov / ics/advisories/icsa-21-159-11
kb.cert.org / vuls/id/321640
tools.cisco.com / security/center/content/CiscoSecurityAdvisory/cisco-sa-20160603-ntpd
kb.cert.org / vuls/id/321640
Third Party AdvisoryUS Government Resource
oracle.com / technetwork/topics/security/bulletinapr2016-2952098.html
Third Party Advisory
securityfocus.com / archive/1/538599/100/0/threaded
securityfocus.com / archive/1/538600/100/0/threaded
securityfocus.com / archive/1/540683/100/0/threaded
securityfocus.com / archive/1/archive/1/538599/100/0/threaded
securityfocus.com / archive/1/archive/1/538600/100/0/threaded
securityfocus.com / archive/1/archive/1/540683/100/0/threaded
securitytracker.com / id/1036037
Third Party AdvisoryVDB Entry
ubuntu.com / usn/USN-3096-1