CVE-2026-18321 — MEDIUM (4.7)

Vulnerability Description

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

4.7

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

HIGH

What is CVE-2026-18321?

CVE-2026-18321 is a vulnerability with a CVSS score of 4.7 (MEDIUM). Buffer overflow in NTPsec's Zyfer refclock allows local attacker to crash ntpd

How severe is CVE-2026-18321?

CVE-2026-18321 has been rated MEDIUM with a CVSS base score of 4.7/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-18321?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.