CVE-2023-4012

Name: CVE-2023-4012
Creator: NVD / NIST
Published: 2023-08-07T18:15:10.19+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.37%

Last modified Jun 17, 2026

CVE-2023-4012 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. ntpd will crash if the server is not NTS-enabled (no certificate) and it receives an NTS-enabled client request (mode 3).. EPSS estimates a 0.37% chance of exploitation in the next 30 days.

Description

ntpd will crash if the server is not NTS-enabled (no certificate) and it receives an NTS-enabled client request (mode 3).

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

0.37%

29.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-372

Affected Software

Vendor	Product	Versions
Ntpsec	Ntpsec	1.2.2

References

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1038422Issue Tracking, Third Party Advisory
https://gitlab.com/NTPsec/ntpsec/-/issues/794Issue Tracking, Vendor Advisory
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1038422Issue Tracking, Third Party Advisory
https://gitlab.com/NTPsec/ntpsec/-/issues/794Issue Tracking, Vendor Advisory

Timeline

Published: Aug 7, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-4012?

ntpd will crash if the server is not NTS-enabled (no certificate) and it receives an NTS-enabled client request (mode 3).

How severe is CVE-2023-4012?

CVE-2023-4012 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.37% probability of exploitation in the next 30 days.

How do I fix CVE-2023-4012?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-4012?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST