CVE-2026-101957
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Improper Initialization in Juniper Junos OS BGP

Publication date: 2026-10-14

Last updated on: 2026-10-14

Assigner: Juniper Networks, Inc.

Description
An Improper Initialization vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a remote BGP peer to cause an rpd crash via an LLGR-stale route update readvertised to a configured non-LLGR peer group.

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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-2026-101957
EUVD
EUVD-2026-101448

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-665 The product does not initialize or incorrectly initializes a resource, which might leave the resource in an unexpected state when it is accessed or used.

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Executive Summary

This vulnerability is an Improper Initialization issue in Juniper Networks Junos OS and Junos OS Evolved. It allows a remote BGP peer to crash the routing protocol daemon (rpd) by sending an LLGR-stale route update that is then readvertised to a non-LLGR peer group.

Detection Guidance

This vulnerability can be detected by monitoring for rpd crashes or BGP session resets. Check logs for LLGR-stale route updates being readvertised to non-LLGR peers. Use commands like 'show system processes extensive | match rpd' to monitor rpd status and 'show bgp neighbor' to verify BGP session stability.

Impact Analysis

This vulnerability can cause rpd crashes, leading to network disruptions, routing instability, and potential loss of connectivity for affected Juniper devices using BGP.

Compliance Impact

The vulnerability could lead to service disruption due to rpd crashes, potentially causing network instability. This may impact compliance with standards requiring high availability and data integrity, such as GDPR's availability principle or HIPAA's requirement for reliable access to protected health information.

Mitigation Strategies

Apply the latest Junos OS or Junos OS Evolved security patches from Juniper Networks to address the improper initialization issue in the routing protocol daemon (rpd). Monitor BGP peer sessions for unexpected rpd crashes or LLGR-stale route updates.

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