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CVE-2016-1548

25
FAUCET Score

CVE-2016-1548 describes a vulnerability in NTP 4.2.8p4 and earlier, and NTPSec, where an attacker can spoof a legitimate NTP server packet to manipulate a client's time synchronization. This can lead to the client rejecting all future legitimate server responses and potentially forcing it to move its time. The vulnerability has a CVSS v3 score of 7.2 (High), indicating a network-based attack with low complexity, requiring no user interaction, and potentially impacting confidentiality and integrity. While there is no known active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has received some community discussion and media coverage, suggesting awareness within the cybersecurity community.

Impacted Technologies

VendorProductVersion(s)CPE
4.2.8CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:4.2.8:p4:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.2HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
LOW
Exploitability Score
3.9
Impact Score
2.7
CvssVersion
3.0

Exploit Intelligence

EPSS Score
3.84%
Probability of exploitation in next 30 days
EPSS Percentile
89.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0384 is in the 81st percentile among its peer group of 51,506 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

Patch Available

Vendor Patches (3)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: ntp-0:4.2.6p5-10.el6.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6.7 Extended Update SupportFixed in: ntp-0:4.2.6p5-5.el6_7.5
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: ntp-0:4.2.6p5-22.el7_2.2
View patch

Vendor Advisories (1)

redhatCVE-2016-1548Moderate

ntp: ntpd switching to interleaved mode with spoofed packets

Apr 26, 2016

References

lists.fedoraproject.org / pipermail/package-announce/2016-May/183647.html
lists.fedoraproject.org / pipermail/package-announce/2016-May/184669.html
lists.opensuse.org / opensuse-security-announce/2016-05/msg00034.html
lists.opensuse.org / opensuse-security-announce/2016-05/msg00037.html
lists.opensuse.org / opensuse-security-announce/2016-05/msg00052.html
lists.opensuse.org / opensuse-security-announce/2016-06/msg00001.html
lists.opensuse.org / opensuse-security-announce/2016-06/msg00020.html
lists.opensuse.org / opensuse-security-announce/2016-07/msg00026.html
lists.opensuse.org / opensuse-security-announce/2016-08/msg00042.html
lists.opensuse.org / opensuse-updates/2016-05/msg00114.html
packetstormsecurity.com / files/136864/Slackware-Security-Advisory-ntp-Updates.html
rhn.redhat.com / errata/RHSA-2016-1552.html
access.redhat.com / errata/RHSA-2016:1141
cert-portal.siemens.com / productcert/pdf/ssa-211752.pdf
cert-portal.siemens.com / productcert/pdf/ssa-497656.pdf
security.freebsd.org / advisories/FreeBSD-SA-16:16.ntp.asc
security.gentoo.org / glsa/201607-15
security.netapp.com / advisory/ntap-20171004-0002
us-cert.cisa.gov / ics/advisories/icsa-21-103-11
us-cert.cisa.gov / ics/advisories/icsa-21-159-11
arista.com / en/support/advisories-notices/security-advisories/1332-security-advisory-19
debian.org / security/2016/dsa-3629
kb.cert.org / vuls/id/718152
talosintelligence.com / vulnerability_reports/TALOS-2016-0082
tools.cisco.com / security/center/content/CiscoSecurityAdvisory/cisco-sa-20160428-ntpd
debian.org / security/2016/dsa-3629
oracle.com / technetwork/topics/security/bulletinapr2016-2952098.html
oracle.com / technetwork/topics/security/linuxbulletinapr2016-2952096.html
securityfocus.com / archive/1/538233/100/0/threaded
securityfocus.com / archive/1/archive/1/538233/100/0/threaded
securityfocus.com / bid/88264
securitytracker.com / id/1035705
talosintelligence.com / reports/TALOS-2016-0082
ExploitThird Party Advisory
ubuntu.com / usn/USN-3096-1