Heap-based buffer overflow in the JJY refclock driver in NTPsec ntpd before 1.2.6 allows an attacker who controls the Telephone JJY time source to corrupt memory or crash ntpd via more than six time replies.

Metrics

No CVSS v4.0

Attack Vector Physical

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

No data.

No data.

No data.

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No data.

Advisories

No advisories yet.

Fixes

Solution

Upgrade to version 1.2.6

Workaround

No workaround given by the vendor.

References
Link Providers
https://gitlab.com/NTPsec/ntpsec/-/commit/62a454f6fcb6f2dcc8d5866f6558905ebdb7dd69 cve-icon cve-icon
https://gitlab.com/NTPsec/ntpsec/-/work_items/895 cve-icon cve-icon
History

Wed, 21 Oct 2026 17:15:00 +0000

Type Values Removed Values Added
Description Heap-based buffer overflow in the JJY refclock driver in NTPsec ntpd before 1.2.6 allows an attacker who controls the Telephone JJY time source to corrupt memory or crash ntpd via more than six time replies.
Title Heap-based Buffer Overflow in ntpsec
Weaknesses CWE-122
References
Metrics cvssV3_1

{'score': 6.4, 'vector': 'CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitLab

Published:

Updated: 2026-10-21T15:03:46.313Z

Reserved: 2026-09-29T09:30:08.025Z

Link: CVE-2026-102484

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-21T16:17:14.043

Modified: 2026-10-21T16:17:14.043

Link: CVE-2026-102484

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-21T19:15:16Z

Weaknesses