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CVE-2026-101980 – Denial of Service (Kernel Crash) – Juniper Networks Junos OS 23.2 through 26.2 (be

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Summary

CVE-2026-101980 is an Integer Underflow vulnerability in the kernel of Juniper Networks Junos OS when Extended Echo is configured. An unauthenticated, network-based attacker can cause a denial of service through a kernel crash. The CVE record rates it CVSS v3.1 9.8 (Critical).

Technical details

  • Root cause: Integer Underflow in the Junos OS kernel.
  • Trigger conditions: Extended Echo must be configured on the device.
  • Attack vector: Network. No authentication is required.
  • Impact: Denial of service through a kernel crash.

Affected software

Junos OS versions before the following fixed releases:

  • 23.2 before 23.2R2-S7.7
  • 23.4 before 23.4R2-S8.13
  • 24.2 before 24.2R2-S5.5
  • 24.4 before 24.4R2-S5
  • 25.2 before 25.2R2-S2
  • 25.4 before 25.4R1-S3
  • 26.2 before 26.2R1-S2

Severity

  • CVSS v3.1 base score: 9.8 (Critical), network attack vector, no authentication required. The source record also lists a CVSS v4.0 score of 9.3 (Critical).
  • The vector string was not confirmed in the sources reviewed.

Mitigation and recommended actions

  • Immediate: Upgrade to a fixed release: 23.2R2-S7.7, 23.4R2-S8.13, 24.2R2-S5.5, 24.4R2-S5, 25.2R2-S2, 25.4R1-S3, 25.4R2, 26.2R1-S2, 26.2R2, 26.4R1, or later.
  • No workarounds are documented. Details are in Juniper advisory JSA112188.

References

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