---
id: CVE-2026-101980
title: >-
  An Integer Underflow vulnerability in the kernel of Juniper Networks Junos OS
  with Extended Echo configured allows an unauthenticated, network-based
  attacker to cause a denial of service by a kernel crash.
summary: >-
  An Integer Underflow vulnerability in the kernel of Juniper Networks Junos OS
  with Extended Echo configured allows an unauthenticated, network-based
  attacker to cause a denial of service by a kernel crash.
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-191
published: '2026-10-14'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T21:17:24.973'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-101980'
references:
  - url: 'https://supportportal.juniper.net/JSA112188'
    label: sirt@juniper.net
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-14T17:44:53.637Z'
vendor: Juniper Networks
product: Junos OS
affected:
  - junos_os < 23.2R2-S7.7
  - junos_os >= 23.4 < 23.4R2-S8.13
  - junos_os >= 24.2 < 24.2R2-S5.5
  - junos_os >= 24.4 < 24.4R2-S5
  - junos_os >= 25.2 < 25.2R2-S2
  - junos_os >= 25.4 < 25.4R1-S3
  - junos_os >= 26.2 < 26.2R1-S2
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-14T20:36:30.599737Z'
---

## Overview

An Integer Underflow vulnerability in the kernel of Juniper Networks Junos OS with Extended Echo configured allows an unauthenticated, network-based attacker to cause a denial of service by a kernel crash.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.