CVE-2016-1548

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Summary

CVECVE-2016-1548
StatePUBLISHED
Assignercertcc
Source PriorityCVE Program / NVD first with legacy fallback
Published2017-01-06 21:59:00 UTC
Updated2026-05-06 22:30:45 UTC
DescriptionAn attacker can spoof a packet from a legitimate ntpd server with an origin timestamp that matches the peer->dst timestamp recorded for that server. After making this switch, the client in NTP 4.2.8p4 and earlier and NTPSec aa48d001683e5b791a743ec9c575aaf7d867a2b0c will reject all future legitimate server responses. It is possible to force the victim client to move time after the mode has been changed. ntpq gives no indication that the mode has been switched.

Risk And Classification

Primary CVSS: v3.0 7.2 HIGH from [email protected]

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

EPSS: 0.054030000 probability, percentile 0.901930000 (date 2026-05-11)

Problem Types: CWE-19 | unspecified

VersionSourceTypeScoreSeverityVector
3.0[email protected]Primary7.2HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L
2.0[email protected]Primary6.4AV:N/AC:L/Au:N/C:N/I:P/A:P

CVSS v3.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
Low
Availability
Low

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

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Low
Authentication
None
Confidentiality
None
Integrity
Partial
Availability
Partial

AV:N/AC:L/Au:N/C:N/I:P/A:P

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Ntp Ntp 4.2.8 p4 All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA NTP Project NTP affected 4.2.8p4 Not specified
CNA NTPsec Project NTPSec affected aa48d001683e5b791a743ec9c575aaf7d867a2b0c Not specified

References

ReferenceSourceLinkTags
openSUSE-SU-2016:1423-1: moderate: Security update for ntp af854a3a-2127-422b-91ae-364da2661108 lists.opensuse.org
Multiple Vulnerabilities in Network Time Protocol Daemon Affecting Cisco Products: April 2016 af854a3a-2127-422b-91ae-364da2661108 tools.cisco.com
Siemens TIM 4R-IE Devices | CISA af854a3a-2127-422b-91ae-364da2661108 us-cert.cisa.gov
Cisco Talos - Talos 2016 0082 af854a3a-2127-422b-91ae-364da2661108 www.talosintelligence.com Exploit, Third Party Advisory
[security-announce] SUSE-SU-2016:1912-1: important: Security update for af854a3a-2127-422b-91ae-364da2661108 lists.opensuse.org
[security-announce] SUSE-SU-2016:1568-1: important: Security update for af854a3a-2127-422b-91ae-364da2661108 lists.opensuse.org
April 2016 Network Time Protocol Daemon (ntpd) Vulnerabilities in Multiple NetApp Products | NetApp Product Security af854a3a-2127-422b-91ae-364da2661108 security.netapp.com
cert-portal.siemens.com/productcert/pdf/ssa-497656.pdf af854a3a-2127-422b-91ae-364da2661108 cert-portal.siemens.com
Vulnerability Note VU#718152 - NTP.org ntpd contains multiple vulnerabilities af854a3a-2127-422b-91ae-364da2661108 www.kb.cert.org
security.FreeBSD.org/advisories/FreeBSD-SA-16:16.ntp.asc af854a3a-2127-422b-91ae-364da2661108 security.FreeBSD.org
[SECURITY] Fedora 24 Update: ntp-4.2.6p5-40.fc24 af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
Security Advisory 0019 - Arista af854a3a-2127-422b-91ae-364da2661108 www.arista.com
[security-announce] SUSE-SU-2016:1278-1: important: Security update for ntp - openSUSE Security Announce - openSUSE Mailing Lists af854a3a-2127-422b-91ae-364da2661108 lists.opensuse.org
Red Hat Customer Portal af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
Red Hat Customer Portal af854a3a-2127-422b-91ae-364da2661108 rhn.redhat.com
cert-portal.siemens.com/productcert/pdf/ssa-211752.pdf af854a3a-2127-422b-91ae-364da2661108 cert-portal.siemens.com
NTP: Multiple vulnerabilities (GLSA 201607-15) — Gentoo Security af854a3a-2127-422b-91ae-364da2661108 security.gentoo.org
ntp Multiple Bugs Let Remote Users Spoof Messages, Obtain Potentially Sensitive Information, Modify Time, and Deny Service - SecurityTracker af854a3a-2127-422b-91ae-364da2661108 www.securitytracker.com
[security-announce] SUSE-SU-2016:1471-1: important: Security update for af854a3a-2127-422b-91ae-364da2661108 lists.opensuse.org
[security-announce] SUSE-SU-2016:1291-1: important: Security update for ntp - openSUSE Security Announce - openSUSE Mailing Lists af854a3a-2127-422b-91ae-364da2661108 lists.opensuse.org
SecurityFocus af854a3a-2127-422b-91ae-364da2661108 www.securityfocus.com
[SECURITY] Fedora 23 Update: ntp-4.2.6p5-40.fc23 af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
Slackware Security Advisory - ntp Updates ≈ Packet Storm af854a3a-2127-422b-91ae-364da2661108 packetstormsecurity.com
SecurityFocus af854a3a-2127-422b-91ae-364da2661108 www.securityfocus.com
Debian -- Security Information -- DSA-3629-1 ntp af854a3a-2127-422b-91ae-364da2661108 www.debian.org
[security-announce] openSUSE-SU-2016:1329-1: important: Security update for ntp - openSUSE Security Announce - openSUSE Mailing Lists af854a3a-2127-422b-91ae-364da2661108 lists.opensuse.org
[security-announce] SUSE-SU-2016:2094-1: important: Security update for af854a3a-2127-422b-91ae-364da2661108 lists.opensuse.org
Oracle Linux Bulletin - April 2016 af854a3a-2127-422b-91ae-364da2661108 www.oracle.com
TALOS-2016-0082 || Cisco Talos Intelligence Group - Comprehensive Threat Intelligence af854a3a-2127-422b-91ae-364da2661108 www.talosintelligence.com
USN-3096-1: NTP vulnerabilities | Ubuntu af854a3a-2127-422b-91ae-364da2661108 www.ubuntu.com
Debian -- Security Information -- DSA-3629-1 ntp af854a3a-2127-422b-91ae-364da2661108 www.debian.org
NTP CVE-2016-1548 Security Bypass Vulnerability af854a3a-2127-422b-91ae-364da2661108 www.securityfocus.com
Siemens SIMATIC NET CP 443-1 OPC UA | CISA af854a3a-2127-422b-91ae-364da2661108 us-cert.cisa.gov
Oracle Solaris Bulletin - April 2016 af854a3a-2127-422b-91ae-364da2661108 www.oracle.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 590721 Siemens TIM 4R-IE Devices Multiple Vulnerabilities (ICSA-21-103-11)
  • 590736 Siemens SIMATIC NET CP 443-1 OPC UA Multiple Vulnerabilities (ICSA-21-159-11)
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