PT-2026-66833 · Ntpsec · Ntpsec

Youngjoon Kim · CVE-2026-18321 · Published 2026-07-31 · Updated 2026-07-31

Mitre

CVSS v3.1

4.7

Medium

Base vector

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

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

Fix

Buffer Overflow

Weakness Enumeration

CWE-120

Related Identifiers

CVE-2026-18321

Affected Products

Ntpsec

References · 2

• https://nvd.nist.gov/vuln/detail/CVE-2026-18321 · Security Note
• https://gitlab.com/NTPsec/ntpsec/-/work_items/890 · Note