PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-101992 Juniper Networks CVE debrief

A BGP peer can cause an rpd crash in Junos OS and Junos OS Evolved when automatic VPLS site ID is used due to improper input validation. This medium-severity vulnerability affects network administrators and security teams responsible for these systems. They should assess exposure and prioritize updates, reviewing BGP peer configurations and monitoring system logs to prevent potential rpd crashes and ensure system stability. The vulnerability is caused by an Improper Input Validation in the routing protocol daemon (rpd) process, allowing a configured BGP peer to cause an rpd crash via a BGP VPLS signaling update.

Vendor
Juniper Networks
Product
Junos OS
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-14
Original CVE updated
2026-10-14
Advisory published
2026-10-14
Advisory updated
2026-10-14

Who should care

Network administrators and security teams responsible for Junos OS and Junos OS Evolved systems should assess exposure and prioritize updates.

Why it matters

CVE-2026-101992 is a medium-severity vulnerability in Junos OS and Junos OS Evolved that can cause an rpd crash when automatic VPLS site ID is used. Network administrators and security teams should prioritize verifying and updating vulnerable versions, reviewing BGP peer configurations, and monitoring system logs.

  • Verify and update vulnerable Junos OS and Junos OS Evolved versions to prevent potential rpd crashes
  • Review and adjust BGP peer configurations and VPLS site ID settings to minimize exposure
  • Monitor system logs and rpd process stability for potential issues

Technical summary

An Improper Input Validation vulnerability in the routing protocol daemon (rpd) process of Juniper Networks Junos OS and Junos OS Evolved allows a configured BGP peer to cause an rpd crash via a BGP VPLS signaling update. The vulnerability affects Junos OS and Junos OS Evolved systems using automatic VPLS site ID. Network administrators and security teams should prioritize verifying and updating vulnerable versions, reviewing BGP peer configurations, and monitoring system logs for potential issues.

Defensive priority

Network administrators should prioritize verifying and updating vulnerable Junos OS and Junos OS Evolved versions.

Recommended defensive actions

  • Verify and update Junos OS and Junos OS Evolved versions to the latest releases
  • Review BGP peer configurations and VPLS site ID settings
  • Monitor rpd process stability and system logs for potential issues

Evidence notes

The CVE record and source item provide details on the vulnerability, but additional information on exploitation and impact is limited. There is no evidence of public exploitation, but defenders should verify and update vulnerable Junos OS and Junos OS Evolved versions, review BGP peer configurations, and monitor system logs. The vendor advisory provides additional information, and the CVE Program record has source-provided CVE metadata.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-101992 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-101992

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-101992 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-101992

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.