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CVE-2020-13817

7.4 · HIGH

ntpd in ntp before 4.2.8p14 and 4.3.x before 4.3.100 allows remote attackers to cause a denial of service (daemon exit or system time change) by predicting transmit timestamps for use in spoofed pa…

Published Jun 4, 2020CWE-330EPSS 3.25%

Overview

CVE-2020-13817 is a high-severity vulnerability. It was published on June 4, 2020 and has a CVSS 3.1 base score of 7.4 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

ntpd in ntp before 4.2.8p14 and 4.3.x before 4.3.100 allows remote attackers to cause a denial of service (daemon exit or system time change) by predicting transmit timestamps for use in spoofed packets. The victim must be relying on unauthenticated IPv4 time sources. There must be an off-path attacker who can query time from the victim's ntpd instance.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Reflists.opensuse.org/opensuse-security-announce/2020-07/msg00005.htmlReflists.opensuse.org/opensuse-security-announce/2020-07/msg00044.htmlRefsupport.ntp.org/bin/view/Main/NtpBug3596Refbugs.ntp.org/show_bug.cgi?id=3596Refsecurity.gentoo.org/glsa/202007-12Refsecurity.netapp.com/advisory/ntap-20200625-0004/Refwww.oracle.com/security-alerts/cpujan2022.htmlReflists.opensuse.org/opensuse-security-announce/2020-07/msg00005.htmlReflists.opensuse.org/opensuse-security-announce/2020-07/msg00044.htmlRefsupport.ntp.org/bin/view/Main/NtpBug3596

How CyberStrike helps

Frequently asked questions

What is CVE-2020-13817?

CVE-2020-13817 is a high-severity vulnerability. It was published on June 4, 2020 and has a CVSS 3.1 base score of 7.4 (HIGH).

How severe is CVE-2020-13817?

This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2020-13817?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2020-13817?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2020-13817 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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