CVE-2026-18321

EUVD-2026-51593
Buffer overflow in NTPsec's Zyfer refclock allows local attacker to crash ntpd
Classic Buffer Overflow
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
GitLabCNA
4.7 MEDIUM
LOCAL
HIGH
LOW
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
ntpsecntpsec
𝑥
< 1.2.5
CNA
Debian logo
Debian Releases
Debian Product
Codename
ntpsec
bookworm
vulnerable
bookworm (security)
vulnerable
bullseye
vulnerable
forky
vulnerable
sid
vulnerable
trixie
vulnerable
Common Weakness Enumeration
References
https://gitlab.com/NTPsec/ntpsec/-/work_items/890