CVE-2026-102020
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Reachable Assertion in Juniper Junos OS via BGP-LS Updates

Publication date: 2026-10-14

Last updated on: 2026-10-16

Assigner: Juniper Networks, Inc.

Description
A Reachable Assertion vulnerability in the rpd process of Juniper Networks Junos OS and Junos OS Evolved allows an authenticated network-based attacker to cause a denial of service via BGP-LS routing updates.

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Meta Information

Published
2026-10-14
Last Modified
2026-10-16
Generated
2026-10-19
AI Q&A
2026-10-15
EPSS Evaluated
2026-10-18
NVD
CVE-2026-102020
EUVD
EUVD-2026-101345

Affected Vendors & Products

Showing 17 associated CPEs
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

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Exploitability

CWE
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KEV
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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.

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Executive Summary

This is a Reachable Assertion vulnerability in Juniper Networks Junos OS and Junos OS Evolved. It exists in the rpd process and can be triggered by an authenticated network-based attacker sending BGP-LS routing updates. This causes a denial of service condition.

Detection Guidance

This vulnerability is specific to Juniper Junos OS and Junos OS Evolved BGP-LS routing updates. Detection requires monitoring the rpd process for crashes or abnormal behavior during BGP-LS updates. Check system logs for rpd crashes or assertion failures. Juniper recommends monitoring for BGP-LS update-related crashes in the rpd process.

Impact Analysis

An attacker could exploit this to crash the rpd process, leading to network disruption. This may cause routing failures, loss of connectivity, or service outages for affected Juniper devices running vulnerable Junos OS or Junos OS Evolved versions.

Compliance Impact

This vulnerability causes a denial of service via BGP-LS routing updates, which could disrupt network availability. Such disruptions may impact compliance with standards requiring continuous availability, such as GDPR for data processing or HIPAA for healthcare systems, by potentially leading to service unavailability.

Mitigation Strategies

Apply the latest Junos OS or Junos OS Evolved security patches from Juniper Networks to address the BGP-LS routing update issue. Monitor BGP-LS traffic for unusual patterns and disable BGP-LS if not required.

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