How severe is CVE-2023-4012?

CVE-2023-4012 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2023-4012 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-4012?

CVE-2023-4012 affects Ntpsec. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-4012?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2023-4012 published?

CVE-2023-4012 was published on 2023-08-07 and last updated on 2026-06-17.

CVE-2023-4012

CVE-2023-4012 is a high-severity vulnerability in Ntpsec with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-372.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (30th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-372
Affected product: Ntpsec
Published: 2023-08-07
Last modified: 2026-06-17

Description

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

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 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2023-4012 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-4012?: CVE-2023-4012 affects Ntpsec. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-4012?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2023-4012 published?: CVE-2023-4012 was published on 2023-08-07 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:ntpsec:ntpsec:1.2.2:*:*:*:*:*:*:*

More vulnerabilities in Ntpsec

CVE-2019-6444 — Critical (CVSS 9.1): An issue was discovered in NTPsec before 1.1.3. process_control() in ntp_control.c has a stack-based buffer over-read…
CVE-2019-6443 — Critical (CVSS 9.1): An issue was discovered in NTPsec before 1.1.3. Because of a bug in ctl_getitem, there is a stack-based buffer…
CVE-2019-6445 — Medium (CVSS 6.5): An issue was discovered in NTPsec before 1.1.3. An authenticated attacker can cause a NULL pointer dereference and ntpd…
CVE-2019-6442 — Medium (CVSS 6.5): An issue was discovered in NTPsec before 1.1.3. An authenticated attacker can write one byte out of bounds in ntpd via…
CVE-2021-22212 — Medium (CVSS 4.0): ntpkeygen can generate keys that ntpd fails to parse. NTPsec 1.2.0 allows ntpkeygen to generate keys with '#'…
CVE-2016-1551 — Low (CVSS 3.7): ntpd in NTP 4.2.8p3 and NTPsec a5fb34b9cc89b92a8fef2f459004865c93bb7f92 relies on the underlying operating system to…

All CVEs affecting Ntpsec →

Other CWE-372 vulnerabilities

CVE-2024-22590 — Critical (CVSS 9.1): The TLS engine in Kwik commit 745fd4e2 does not track the current state of the connection. This vulnerability can allow…
CVE-2020-27222 — High (CVSS 7.5): In Eclipse Californium version 2.3.0 to 2.6.0, the certificate based (x509 and RPK) DTLS handshakes accidentally fails,…
CVE-2026-41388 — Medium (CVSS 6.5): OpenClaw before 2026.3.31 contains a configuration management vulnerability where startup migration treats empty-array…
CVE-2026-41340 — Medium (CVSS 6.5): OpenClaw before 2026.3.31 contains an authentication boundary vulnerability where Telegram legacy allowFrom migration…
CVE-2026-41300 — Medium (CVSS 6.5): OpenClaw before 2026.3.31 contains a trust-decline vulnerability that preserves attacker-discovered endpoints in remote…
CVE-2023-36834 — Medium (CVSS 6.5): An Incomplete Internal State Distinction vulnerability in the packet forwarding engine (PFE) of Juniper Networks Junos…

Browse all CWE-372 vulnerabilities →