CVE-2026-18321: Ntpsec

Medium severity, CVSS 4.7. EPSS: 0.1% chance of exploitation in the next 30 days.

Buffer overflow in NTPsec's Zyfer refclock allows local attacker to crash ntpd

Affected products

• Ntpsec Ntpsec: before 1.2.5 (fixed in 1.2.5)

Published 2026-07-31. Last modified 2026-08-28.