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CVE-2026-18321

CVE-2026-18321 · Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') in ntpsec

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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

CVSS 4.7 · Medium · EPSS 0.1% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • ntpsec

    Versions
    • ≥ 0, < 1.2.5: Affected (semver)

    Update to 1.2.5

  • ntpsec Debian:12

    Versions
    • 1.2.2+dfsg1-1
    • 1.2.2+dfsg1-1+deb12u1
    • 1.2.2+dfsg1-2
    • 1.2.2+dfsg1-3
    • 1.2.2+dfsg1-4
    • 1.2.3+dfsg1-1
    • 1.2.3+dfsg1-2
    • 1.2.3+dfsg1-3
    • 1.2.3+dfsg1-4
    • 1.2.3+dfsg1-5
    • 1.2.3+dfsg1-6
    • 1.2.3+dfsg1-7
    • 1.2.3+dfsg1-8
    • 1.2.4+dfsg-1
    • 1.2.5+dfsg-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • ntpsec Debian:13

    Versions
    • 1.2.3+dfsg1-8
    • 1.2.4+dfsg-1
    • 1.2.5+dfsg-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • ntpsec Debian:14

    Versions
    • 1.2.3+dfsg1-8
    • 1.2.4+dfsg-1
    Affected ranges
    • ECOSYSTEM: < 1.2.5+dfsg-1

    Update to 1.2.5+dfsg-1

  • ntpsec Ubuntu:18.04:LTS

    Versions
    • 1.0.0+dfsg1-1
    • 1.0.0+dfsg1-3
    • 1.1.0+dfsg1-1
    • 1.1.0+dfsg1-1ubuntu0.1
    • 1.1.0+dfsg1-1ubuntu0.2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • ntpsec Ubuntu:20.04:LTS

    Versions
    • 1.1.3+dfsg1-2
    • 1.1.7+dfsg1-1
    • 1.1.7+dfsg1-2
    • 1.1.8+dfsg1-1
    • 1.1.8+dfsg1-3
    • 1.1.8+dfsg1-4
    • 1.1.8+dfsg1-4build1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • ntpsec Ubuntu:22.04:LTS

    Versions
    • 1.2.0+dfsg1-4
    • 1.2.1+dfsg1-2
    • 1.2.1+dfsg1-3
    • 1.2.1+dfsg1-3ubuntu1
    • 1.2.1+dfsg1-4
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • ntpsec Ubuntu:24.04:LTS

    Versions
    • 1.2.2+dfsg1-2
    • 1.2.2+dfsg1-3
    • 1.2.2+dfsg1-4
    • 1.2.2+dfsg1-4build1
    • 1.2.2+dfsg1-4build2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • ntpsec Ubuntu:26.10

    Versions
    • 1.2.3+dfsg1-8ubuntu2
    • 1.2.3+dfsg1-8ubuntu3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • ntpsec Ubuntu:26.04:LTS

    Versions
    • 1.2.3+dfsg1-8ubuntu1
    • 1.2.3+dfsg1-8ubuntu2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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