CVE-2026-18321 in NTPsec

Summary

by MITRE • 07/31/2026

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

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• Responsible: GitLab
• Reservation: 07/29/2026
• Disclosure: 07/31/2026
• Moderation: accepted
• Entry: VDB-385122
• CPE: ready
• CWE: CWE-120 (confirmed)
• CVSS: 5.5 (VulDB)
• EPSS: 0.00000
• KEV: no
• Activities: low

Sources

• MITRE: https://www.cve.org/CVERecord?id=CVE-2026-18321
• NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-18321
• CVE Details: https://www.cvedetails.com/cve/CVE-2026-18321/