CVE-2026-101976
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Out-of-Bounds Write in Juniper Junos OS BGP Update Handling

Publication date: 2026-10-14

Last updated on: 2026-10-14

Assigner: Juniper Networks, Inc.

Description
An Out-of-bounds Write vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an eBGP peer which has not negotiated four-octet-AS capability sending a specifically malformed BGP update to cause a Denial-of-Service (DoS).

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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-2026-101976
EUVD
EUVD-2026-101414

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-787 The product writes data past the end, or before the beginning, of the intended buffer.

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Executive Summary

This vulnerability is an Out-of-bounds Write flaw in Juniper Networks Junos OS and Junos OS Evolved routing protocol daemon (rpd). It occurs when an eBGP peer sends a malformed BGP update without negotiating the four-octet-AS capability, causing a Denial-of-Service (DoS).

Detection Guidance

Detecting this vulnerability requires monitoring for unexpected BGP updates or crashes in Juniper Junos OS devices. Check logs for rpd crashes or BGP session resets. Use 'show system processes extensive | match rpd' to verify rpd status and 'show log messages | match rpd' for crash logs. Monitor BGP neighbors with 'show bgp neighbor' for unexpected session drops.

Impact Analysis

The vulnerability can lead to a Denial-of-Service (DoS) condition, disrupting network services and causing downtime for affected Juniper devices running Junos OS or Junos OS Evolved.

Compliance Impact

This vulnerability does not directly affect compliance with GDPR or HIPAA as it pertains to a network routing protocol issue causing DoS. However, a DoS condition could disrupt services handling personal or health data, potentially violating availability requirements in GDPR Article 32 or HIPAA Security Rule.

Mitigation Strategies

Apply the latest Junos OS or Junos OS Evolved patches from Juniper Networks to address the out-of-bounds write vulnerability in the routing protocol daemon (rpd).

Monitor BGP sessions for peers not negotiating four-octet-AS capability and restrict or filter malformed BGP updates from untrusted peers.

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