CVE-2016-4954

mediumPriorität · verfolgen · 35EPSS 0.133 · 96. PerzentilDEEUUS
grimoire priorityP1 · Urgent
Exploitable?
—
no known exploitation
Likely / severe?
13.3% (96th) EPSS
CVSS 5 · medium
Is it mine?
32 products
Prüfe deine Angriffsfläche
Who says so?
6 sources
cnnvd · enisa_euvd · auma_psirt · cisa_csaf_ot

EPSS · bewertet 2026-10-23

The process_packet function in ntp_proto.c in ntpd in NTP 4.x before 4.2.8p8 allows remote attackers to cause a denial of service (peer-variable modification) by sending spoofed packets from many source IP addresses in a certain scenario, as demonstrated by triggering an incorrect leap indication.

01

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

  • WorkaroundSIPLUS NET TIM 4R-IE (6AG1800-4BA00-7AA0)siemens_psirt

    Configure an additional firewall to prevent communication to the port udp/123 of an affected device.

  • WorkaroundSIPLUS NET TIM 4R-IE DNP3 (6AG1803-4BA00-7AA0)siemens_psirt

    Configure an additional firewall to prevent communication to the port udp/123 of an affected device.

  • WorkaroundTIM 4R-IE (6NH7800-4BA00)siemens_psirt

    Configure an additional firewall to prevent communication to the port udp/123 of an affected device.

  • WorkaroundTIM 4R-IE DNP3 (6NH7803-4BA00-0AA0)siemens_psirt

    Configure an additional firewall to prevent communication to the port udp/123 of an affected device.

  • WorkaroundSIPLUS NET TIM 4R-IE (6AG1800-4BA00-7AA0)cisa_csaf_ot

    Configure an additional firewall to prevent communication to the port udp/123 of an affected device.

  • WorkaroundSIPLUS NET TIM 4R-IE DNP3 (6AG1803-4BA00-7AA0)cisa_csaf_ot

    Configure an additional firewall to prevent communication to the port udp/123 of an affected device.

  • WorkaroundTIM 4R-IE (6NH7800-4BA00)cisa_csaf_ot

    Configure an additional firewall to prevent communication to the port udp/123 of an affected device.

  • WorkaroundTIM 4R-IE DNP3 (6NH7803-4BA00-0AA0)cisa_csaf_ot

    Configure an additional firewall to prevent communication to the port udp/123 of an affected device.

  • Kein Fix geplantSIMATIC CP 443-1 OPC UAsiemens_psirt

    Currently no remediation is planned

  • Kein Fix geplantSIPLUS NET TIM 4R-IE (6AG1800-4BA00-7AA0)siemens_psirt

    Currently no fix is planned

  • Kein Fix geplantSIPLUS NET TIM 4R-IE DNP3 (6AG1803-4BA00-7AA0)siemens_psirt

    Currently no fix is planned

  • Kein Fix geplantTIM 4R-IE (6NH7800-4BA00)siemens_psirt

    Currently no fix is planned

  • Kein Fix geplantTIM 4R-IE DNP3 (6NH7803-4BA00-0AA0)siemens_psirt

    Currently no fix is planned

  • Kein Fix geplantSIPLUS NET TIM 4R-IE (6AG1800-4BA00-7AA0)cisa_csaf_ot

    Currently no fix is planned

  • Kein Fix geplantSIPLUS NET TIM 4R-IE DNP3 (6AG1803-4BA00-7AA0)cisa_csaf_ot

    Currently no fix is planned

  • Kein Fix geplantTIM 4R-IE (6NH7800-4BA00)cisa_csaf_ot

    Currently no fix is planned

  • Kein Fix geplantTIM 4R-IE DNP3 (6NH7803-4BA00-0AA0)cisa_csaf_ot

    Currently no fix is planned

  • Kein Fix geplantSIMATIC CP 443-1 OPC UAcisa_csaf_ot

    Currently no remediation is planned

02

cvss

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

7.5
010

Basiswert 0–10 · höher = schwerwiegender · Vektor überfahren zum Auflösen⚠ Quellen uneinig · medium–high · 5–7.5

v2.05mediumAV:N/AC:L/Au:N/C:N/I:N/A:Pprimary · NVD / NIST USAusnutzbarkeit 10 · Auswirkung 2.9
v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USAusnutzbarkeit 3.9 · Auswirkung 3.6
v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · CISA US
v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · Siemens ProductCERT DE
v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)
v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · AUMA PSIRT
03

schwächen

Die CWE-Schwächeklassen, zu denen dies gehört.

CWE-362USprimärCWE-362USCWE-362USCWE-362US
04

betroffene Produkte (32)

Betroffene Produkte und Versionsbereiche.

20 von 32 angezeigt
05

Advisories (5)

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.

  • SSA-497656SSA-497656: Multiple NTP Vulnerabilities in TIM 4R-IE Devices2021-04-13csaf · siemens_psirtDE

    TIM 4R-IE devices contain multiple vulnerabilities in the integrated NTP component as listed below. Siemens recommends specific countermeasures for products where fixes 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-21-103-11Siemens TIM 4R-IE Devices2021-04-13icsa · cisa_csaf_otUS

    TIM 4R-IE devices contain multiple vulnerabilities in the integrated NTP component as listed below. Siemens recommends specific countermeasures for products where fixes are not, or not yet available.

  • 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.

06

auch bekannt als (3)

Weitere Namen und Kennungen dieser Entität.

07

quellen

Welche Quellen diesen Datensatz belegen und wann.

cnnvdenisa_euvdauma_psirtcisa_csaf_otnvdsiemens_psirtNVDCVE.orgMITRE
veröffentlicht 2016-07-05geändert 2026-06-17
09

Referenzen (89)

Externe Belege — Patches, Meldungen, Analysen.

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