CVE-2026-18321: medium-severity vulnerability in ntpsec
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') in ntpsec
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 4.7epss 0.1%
Buffer overflow in NTPsec's Zyfer refclock allows local attacker to crash ntpd
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Affected products
NTPsec · ntpsecRelated CVEs — ntpsec
In the same product, most dangerous first.
CVE-2026-102486HIGHOut-of-bounds Read in ntpsecEPSS 0.5%CVE-2021-22212MEDIUMCVE-2021-22212EPSS 0.5%CVE-2023-4012HIGHIncomplete Internal State Distinction in ntpsecEPSS 0.4%CVE-2026-102483HIGHReachable Assertion in ntpsecEPSS 0.4%CVE-2026-102484MEDIUMHeap-based Buffer Overflow in ntpsecEPSS 0.2%CVE-2026-102485MEDIUMOut-of-bounds Read in ntpsecEPSS 0.2%