What’s Vulnerable › Vulnerabilities

CVE-2023-4012: Incomplete Internal State Distinction in ntpsec

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-08-07 · updated 2026-06-17
• Weakness: CWE-372

Description

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

Affected products

• ntpsec: 1.2.2

References

• https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1038422
• https://gitlab.com/NTPsec/ntpsec/-/issues/794
• https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1038422
• https://gitlab.com/NTPsec/ntpsec/-/issues/794

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