---
id: CVE-2026-102177
title: >-
  An Out-of-bounds Write vulnerability in the routing protocol daemon (rpd) of
  Juniper Networks Junos OS and Junos OS Evolved allows an adjacent
  unauthenticated attacker to cause a denial of service when IS-IS link
  protection and backup-se…
summary: >-
  An Out-of-bounds Write vulnerability in the routing protocol daemon (rpd) of
  Juniper Networks Junos OS and Junos OS Evolved allows an adjacent
  unauthenticated attacker to cause a denial of service when IS-IS link
  protection and backup-se…
severity: high
cvss: 7.6
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H'
cwe:
  - CWE-787
published: '2026-10-14'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T17:18:05.453'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-102177'
references:
  - url: 'https://supportportal.juniper.net/JSA112187'
    label: sirt@juniper.net
tags:
  - nvd
ingestedAt: '2026-10-14T17:44:53.669Z'
---

## Overview

An Out-of-bounds Write vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent unauthenticated attacker to cause a denial of service when IS-IS link protection and backup-selection are configured.

## Remediation

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