CVE-2026-101949
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NULL Pointer Dereference in Juniper Junos OS and Junos OS Evolved RPD

Publication date: 2026-10-14

Last updated on: 2026-10-14

Assigner: Juniper Networks, Inc.

Description
A NULL Pointer Dereference vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated remote BGP neighbor to cause a denial of service via a VPN-flowspec BGP update if it is readvertised and BMP post-policy RIB-out monitoring is configured.

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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-2026-101949
EUVD
EUVD-2026-101318

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-476 The product dereferences a pointer that it expects to be valid but is NULL.

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Executive Summary

This is a NULL Pointer Dereference vulnerability in Juniper Networks Junos OS and Junos OS Evolved. It allows an unauthenticated remote BGP neighbor to cause a denial of service by sending a VPN-flowspec BGP update that is readvertised while BMP post-policy RIB-out monitoring is enabled.

Detection Guidance

Detection requires checking for BGP neighbor issues and BMP monitoring configuration. Inspect BGP sessions for unexpected disconnections or crashes. Review routing protocol daemon logs for NULL pointer dereference errors. Verify if BMP post-policy RIB-out monitoring is enabled on affected Junos OS versions.

Impact Analysis

The vulnerability can lead to a denial of service, causing network disruption or outages. It may affect routing stability and availability of Juniper devices running vulnerable Junos OS or Junos OS Evolved versions.

Compliance Impact

This vulnerability causes a denial of service via a NULL Pointer Dereference in Juniper Junos OS and Junos OS Evolved when specific BGP updates are processed. This could lead to service disruption, potentially impacting data availability and integrity, which are critical for compliance with standards like GDPR and HIPAA that require continuous access to personal or health data.

Mitigation Strategies

Apply the latest Junos OS or Junos OS Evolved security patches from Juniper Networks to address the NULL Pointer Dereference vulnerability in the routing protocol daemon (rpd). Disable BMP post-policy RIB-out monitoring if configured and avoid readvertising VPN-flowspec BGP updates from untrusted neighbors.

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