CVE-2016-1550

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Summary

CVECVE-2016-1550
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 exploitable vulnerability exists in the message authentication functionality of libntp in ntp 4.2.8p4 and NTPSec a5fb34b9cc89b92a8fef2f459004865c93bb7f92. An attacker can send a series of crafted messages to attempt to recover the message digest key.

Risk And Classification

Primary CVSS: v3.0 5.3 MEDIUM from [email protected]

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

EPSS: 0.031270000 probability, percentile 0.869520000 (date 2026-05-11)

Problem Types: CWE-200 | unspecified

VersionSourceTypeScoreSeverityVector
3.0[email protected]Primary5.3MEDIUMCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
2.0[email protected]Primary5AV:N/AC:L/Au:N/C:P/I:N/A:N

CVSS v3.0 Breakdown

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

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

CVSS v2.0 Breakdown

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

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

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 4.2.8p3 Not specified
CNA NTP Project NTP affected 4.2.8p4 Not specified
CNA NTPsec Project NTPSec affected a5fb34b9cc89b92a8fef2f459004865c93bb7f92 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
TALOS-2016-0084 || Cisco Talos Intelligence Group - Comprehensive Threat Intelligence af854a3a-2127-422b-91ae-364da2661108 www.talosintelligence.com
[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
Cisco Talos - Talos 2016 0084 af854a3a-2127-422b-91ae-364da2661108 www.talosintelligence.com Technical Description, Third Party Advisory
[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
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-2016-1550 Local 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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