CVE-2026-101999
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Reachable Assertion in Juniper Networks Junos OS via IPv6 Prefix FEC

Publication date: 2026-10-14

Last updated on: 2026-10-14

Assigner: Juniper Networks, Inc.

Description
A Reachable Assertion vulnerability in the rpd process of Juniper Networks Junos OS and Junos EVO allows an adjacent attacker to cause a denial of service via an established LDP session carrying an IPv6 Prefix FEC in a specific Label message.

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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-2026-101999
EUVD
EUVD-2026-101329

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 EVO. An adjacent attacker can exploit it by sending a specific IPv6 Prefix FEC in a Label message over an established LDP session, causing a denial of service by crashing the rpd process.

Detection Guidance

This vulnerability can be detected by monitoring for unexpected crashes or high CPU usage in the rpd process on Juniper devices. Check for LDP sessions carrying IPv6 Prefix FEC in Label messages. Use commands like 'show system processes extensive', 'show ldp session', and 'show log messages' to inspect for anomalies.

Impact Analysis

The vulnerability allows an attacker to disrupt network services by causing the rpd process to crash, leading to a denial of service. This can interrupt routing and forwarding functions, affecting network availability.

Compliance Impact

This vulnerability causes a denial of service via an established LDP session, which could disrupt network availability. Such disruptions may impact systems handling sensitive data, potentially violating compliance requirements for availability in standards like GDPR and HIPAA.

Mitigation Strategies

Update Junos OS or Junos EVO to the latest patched version to address the Reachable Assertion vulnerability in the rpd process.

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