CVE-2020-13817

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.

Category

7.4
CVSS
Severity: High
CVSS 3.1 •
CVSS 3.0 •
CVSS 2.0 •
EPSS 0.49%
Vendor Advisory opensuse.org Vendor Advisory opensuse.org Vendor Advisory gentoo.org Vendor Advisory ntp.org Vendor Advisory ntp.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00005.html vendor advisory mailing list third party advisory
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00044.html vendor advisory mailing list third party advisory
https://security.gentoo.org/glsa/202007-12 third party advisory vendor advisory
https://www.oracle.com/security-alerts/cpujan2022.html third party advisory patch
http://support.ntp.org/bin/view/Main/NtpBug3596 vendor advisory
https://bugs.ntp.org/show_bug.cgi?id=3596 vendor advisory issue tracking
https://security.netapp.com/advisory/ntap-20200625-0004/ third party advisory

Frequently Asked Questions

What is the severity of CVE-2020-13817?
CVE-2020-13817 has been scored as a high severity vulnerability.
How to fix CVE-2020-13817?
To fix CVE-2020-13817, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-13817 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2020-13817 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.