CVE-2026-101984

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Reachable Assertion in Juniper Junos OS BGP Labeled-Unicast

Publication date: 2026-10-14

Last updated on: 2026-10-14

Assigner: Juniper Networks, Inc.

Description

A Reachable Assertion vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a network-adjacent BGP peer to cause a denial of service when labeled-unicast aggregate-label is configured.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-10-14

Last Modified

2026-10-14

Generated

2026-10-19

AI Q&A

2026-10-15

EPSS Evaluated

2026-10-18

NVD

CVE-2026-101984

EUVD

EUVD-2026-101485

Affected Vendors & Products

Vendor	Product	Version / Range
Juniper	Networks	Junos OS 0
Juniper	Networks	Junos OS 23.4
Juniper	Networks	Junos OS 24.2
Juniper	Networks	Junos OS 24.4
Juniper	Networks	Junos OS 25.2
Juniper	Networks	Junos OS 25.4
Juniper	Networks	Junos OS 26.2
Juniper	Networks	Junos OS Evolved 0
Juniper	Networks	Junos OS Evolved 23.4
Juniper	Networks	Junos OS Evolved 24.2
Juniper	Networks	Junos OS Evolved 24.4
Juniper	Networks	Junos OS Evolved 25.2
Juniper	Networks	Junos OS Evolved 25.4
Juniper	Networks	Junos OS Evolved 26.2
Juniper	Networks	Junos OS Evolved 23.4X100
Juniper	Networks	Junos OS Evolved 25.2X100
Juniper	Networks	Junos OS Evolved 25.4X300

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-617	The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.

Attack-Flow Graph

Executive Summary

This vulnerability is a Reachable Assertion in Juniper Networks Junos OS and Junos OS Evolved. It allows a network-adjacent BGP peer to cause a denial of service when the labeled-unicast aggregate-label feature is configured.

Impact Analysis

The vulnerability can lead to a denial of service, disrupting network operations and causing service outages for affected systems running vulnerable versions of Junos OS or Junos OS Evolved.

Compliance Impact

This vulnerability causes a denial of service in routing protocol daemon (rpd) when labeled-unicast aggregate-label is configured, which could disrupt network availability. Disruptions may impact systems handling sensitive data, potentially violating compliance requirements for availability in standards like GDPR and HIPAA.

Mitigation Strategies

Disable labeled-unicast aggregate-label configuration on BGP peers if not required. Apply Junos OS patches from Juniper Networks when available. Monitor routing protocol daemon (rpd) logs for abnormal termination or crashes.

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