CVE-2016-4955

mediumPriorität · verfolgen · 27EPSS 0.088 · 95. PerzentilDEEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

8.77% (95th) EPSS

CVSS 4.3 · medium

Is it mine?

21 products

Prüfe deine Angriffsfläche

Who says so?

6 sources

cnnvd · enisa_euvd · auma_psirt · cisa_csaf_ot

EPSS · bewertet 2026-10-27

ntpd in NTP 4.x before 4.2.8p8, when autokey is enabled, allows remote attackers to cause a denial of service (peer-variable clearing and association outage) by sending (1) a spoofed crypto-NAK packet or (2) a packet with an incorrect MAC value at a certain time.

Behebungen

Hersteller-Fix, Mitigation oder Workaround, wie von den Quellen veröffentlicht.

Ein Hersteller-Fix ist verfügbar.

BehobenSIMA² Master Stationauma_psirt
Upgrade your SIMA2 to software version 2.6 or above. The NTP service of the SIMA2 Master Station with software version V2.6 and above includes a current, supported version of ntpd.
MitigationSIMATIC CP 443-1 OPC UAsiemens_psirt
Configure an additional firewall to prevent communication to port udp/123 of an affected device
MitigationSIMA² Master Stationauma_psirt
1. If your SIMA2 does not need to provide time information to other systems or synchronize itself with an NTP server, disable the NTP client on those systems. Please note that the NTP client is disabled by default in SIMA2 2. In case you must use the NTP server on an SIMA2, choose from the following options to reduce NTP-based risks: - Allow NTP traffic to/from trusted NTP clients only - Monitor the network for malicious NTP traffic going to/coming from the SIMA2 - Filter malicious NTP traffic going to/coming from the SIMA2 Monitor NTP server operations on your SIMA2 (server availability, correctness of advertised time, NTP-related log entries, etc.) 3. In case you must use the NTP client on an SIMA2, choose from the following options to reduce NTP-based risks: - Use trusted NTP servers only - Allow NTP traffic to/from trusted NTP servers only - Monitor the network for malicious NTP traffic targeting the SIMA2 - Filter malicious NTP traffic targeting the SIMA2 - Monitor NTP client operations on your SIMA2 (correctness of system time, NTP-related log entries, etc.)
MitigationSIMATIC CP 443-1 OPC UAcisa_csaf_ot
Configure an additional firewall to prevent communication to port udp/123 of an affected device
Kein Fix geplantSIMATIC CP 443-1 OPC UAsiemens_psirt
Currently no remediation is planned
Kein Fix geplantSIMATIC CP 443-1 OPC UAcisa_csaf_ot
Currently no remediation is planned

cvss

Technischer Schweregrad, 0–10. Eine Zeile je Quelle.

5.9

010

Basiswert 0–10 · höher = schwerwiegender · Vektor überfahren zum Auflösen

v2.04.3mediumAV:N/AC:M/Au:N/C:N/I:N/A:Pprimary · NVD / NIST USAusnutzbarkeit 8.6 · Auswirkung 2.9

v3.15.9mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USAusnutzbarkeit 2.2 · Auswirkung 3.6

v3.15.9mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:Csecondary · CISA US

v3.15.9mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:Csecondary · Siemens ProductCERT DE

v3.15.4mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

v3.15.9mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · AUMA PSIRT

schwächen

Die CWE-Schwächeklassen, zu denen dies gehört.

CWE-362USprimärCWE-362USCWE-362USCWE-362US

betroffene Produkte (21)

Betroffene Produkte und Versionsbereiche.

AUMA SIMA² Master Stationalle Versionenfixedauma_psirtDE
AUMA SIMA² Master Station< V2.6auma_psirtDE
SIMATIC CP 443-1 OPC UA (6GK7443-1UX00-0XE0)alle Versionencisa_csaf_otUS
Siemens SIMATIC CP 443-1 OPC UA≤ vers:all/*cisa_csaf_otUS
n/a n/a≤ n/aenisa_euvdEU
novell suse manager= 2.1nvdUScpe:2.3:o:novell:suse_manager:*:*:*:*:*:*:*:*
ntp ntp4.2.0 → 4.2.8nvdUScpe:2.3:a:ntp:ntp:*:*:*:*:*:*:*:*
ntp ntp= 4.2.8nvdUScpe:2.3:a:ntp:ntp:*:*:*:*:*:*:*:*
ntp ntp4.3.0 → 4.3.93nvdUScpe:2.3:a:ntp:ntp:*:*:*:*:*:*:*:*
opensuse leap= 42.1nvdUScpe:2.3:o:opensuse:leap:*:*:*:*:*:*:*:*
opensuse opensuse= 13.2nvdUScpe:2.3:o:opensuse:opensuse:*:*:*:*:*:*:*:*
oracle solaris= 10nvdUScpe:2.3:o:oracle:solaris:*:*:*:*:*:*:*:*
oracle solaris= 11.3nvdUScpe:2.3:o:oracle:solaris:*:*:*:*:*:*:*:*
siemens simatic net cp 443-1 opc ua firmwarealle VersionennvdUScpe:2.3:o:siemens:simatic_net_cp_443-1_opc_ua_firmware:*:*:*:*:*:*:*:*
suse linux enterprise desktop= 12nvdUScpe:2.3:o:suse:linux_enterprise_desktop:*:*:*:*:*:*:*:*
suse linux enterprise server= 11nvdUScpe:2.3:o:suse:linux_enterprise_server:*:*:*:*:*:*:*:*
suse linux enterprise server= 12nvdUScpe:2.3:o:suse:linux_enterprise_server:*:*:*:*:*:*:*:*
suse manager proxy= 2.1nvdUScpe:2.3:a:suse:manager_proxy:*:*:*:*:*:*:*:*
suse openstack cloud= 5nvdUScpe:2.3:a:suse:openstack_cloud:*:*:*:*:*:*:*:*
Siemens SIMATIC CP 443-1 OPC UA≤ vers:all/*siemens_psirtDE

20 von 21 angezeigt

Advisories (3)

Hersteller- und Ökosystem-Meldungen dazu.

SSA-211752SSA-211752: Multiple NTP-Client Related Vulnerabilities in SIMATIC CP 443-1 OPC UA2021-06-08csaf · siemens_psirtDE
All versions of the SIMATIC CP 443-1 OPC UA contain multiple vulnerabilities in the underlying third party component NTP. Siemens recommends specific countermeasures for products where updates are not, or not yet available.
VDE-2022-032AUMA: Multiple Vulnerabilities in Automation Runtime NTP Service2022-08-09csaf · auma_psirtDE
The SIMA2 Master Station features an NTP service based on ntpd, a reference implementation of the Network Time Protocol (NTP). Affected SIMA2 Master Stations with software version < V2.6 include an outdated version of ntpd which is affected by a large number of vulnerabilities
ICSA-21-159-11Siemens SIMATIC NET CP 443-1 OPC UA2021-06-08icsa · cisa_csaf_otUS
All versions of the SIMATIC CP 443-1 OPC UA contain multiple vulnerabilities in the underlying third party component NTP. Siemens recommends specific countermeasures for products where updates are not, or not yet available.

auch bekannt als (3)

Weitere Namen und Kennungen dieser Entität.

quellen

Welche Quellen diesen Datensatz belegen und wann.

cnnvd enisa_euvd auma_psirt cisa_csaf_ot nvd siemens_psirt NVD CVE.org MITRE

veröffentlicht 2016-07-05geändert 2026-06-17

verwandt (4,139)

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In the Linux kernel, the following vulnerability has been resolved: crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg Issuing two writes to the same af_alg socket is…
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VMware ESXi, and Workstation contain a TOCTOU (Time-of-Check Time-of-Use) vulnerability that leads to an out-of-bounds write. A malicious actor with local administrative privileges…
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Windows Search Remote Code Execution Vulnerability

+4134 weitere

Referenzen (79)

Externe Belege — Patches, Meldungen, Analysen.

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