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Vulnerability record · CVE-2023-4012 · published 7 August 2023

CVE-2023-4012: Ntpsec vulnerability

Ntpsec · Ntpsec

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

7.5 CVSS 3.1 High EPSS 0.45% · top 63.4% CWE-372 · CWE-372
7.5CVSS 3.1 base score
0.45%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

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

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1038422 Issue TrackingThird Party Advisory
https://gitlab.com/NTPsec/ntpsec/-/issues/794 Issue TrackingVendor Advisory
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1038422 Issue TrackingThird Party Advisory
https://gitlab.com/NTPsec/ntpsec/-/issues/794 Issue TrackingVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.1CVE-2019-6443NTPsec ntpd stack buffer over-read via ctl_getitem in read_sysvarsNTPsec before 1.1.3 contains a bug in ctl_getitem that causes a stack-based buffer over-read in read_sysvars in ntp_control.c within ntpd. The flaw i…EPSS 67%analysed9.1CVE-2019-6444NTPsec ntpd control packet stack buffer over-readNTPsec before 1.1.3 has a stack-based buffer over-read in process_control() in ntp_control.c, where attacker-controlled data is dereferenced by ntohl…EPSS 46%analysed7.4CVE-2021-22212Ntpsec broken cryptographic algorithm vulnerabilityntpkeygen can generate keys that ntpd fails to parse. NTPsec 1.2.0 allows ntpkeygen to generate keys with '#' characters. ntpd then either pads, shor…EPSS 0.52%6.5CVE-2019-6445Ntpsec null pointer dereference vulnerabilityAn issue was discovered in NTPsec before 1.1.3. An authenticated attacker can cause a NULL pointer dereference and ntpd crash in ntp_control.c, relat…EPSS 14%6.5CVE-2019-6442Ntpsec out-of-bounds write vulnerabilityAn issue was discovered in NTPsec before 1.1.3. An authenticated attacker can write one byte out of bounds in ntpd via a malformed config request, re…EPSS 14%3.7CVE-2016-1551Ntp vulnerabilityntpd in NTP 4.2.8p3 and NTPsec a5fb34b9cc89b92a8fef2f459004865c93bb7f92 relies on the underlying operating system to protect it from requests that im…EPSS 2.2%

Source: NIST National Vulnerability Database (record CVE-2023-4012), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.