CVE-2026-101990
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Stack-based Buffer Overflow in Juniper Networks Junos OS and Junos OS Evolved

Publication date: 2026-10-14

Last updated on: 2026-10-16

Assigner: Juniper Networks, Inc.

Description
A Stack-based Buffer Overflow vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a remote configured BGP peer to cause an rpd crash, or on Junos OS remote code-execution, via sending a flow-spec update which is selected for re-advertisement.

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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-2026-101990
EUVD
EUVD-2026-101480

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-121 A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).

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Executive Summary

This vulnerability is a stack-based buffer overflow in Juniper Networks Junos OS and Junos OS Evolved. It occurs in the routing protocol daemon (rpd) and can be triggered by a remote configured BGP peer sending a flow-spec update that is selected for re-advertisement. This may cause an rpd crash or, on Junos OS, potentially allow remote code execution.

Detection Guidance

This vulnerability can be detected by monitoring for crashes in the routing protocol daemon (rpd) or unusual BGP flow-spec update activity. Check logs for rpd crashes or unexpected behavior. Use commands like 'show system processes extensive | match rpd' to monitor rpd status and 'show log messages | match rpd' to review rpd-related logs.

Impact Analysis

A remote attacker could exploit this flaw to crash the routing protocol daemon, disrupting network operations. On Junos OS, it may lead to remote code execution, allowing the attacker to take control of the affected system. This could result in network outages, unauthorized access, or further compromise of network infrastructure.

Compliance Impact

This vulnerability allows remote code execution via BGP flow-spec updates, which could lead to unauthorized access or data breaches. Such incidents may violate GDPR's data protection requirements or HIPAA's security rules, depending on the affected system's use case.

Mitigation Strategies

Apply the latest Junos OS or Junos OS Evolved security patches from Juniper Networks immediately. Disable BGP flow-spec updates if not required. Monitor rpd logs for crashes or unusual activity. Restrict BGP peer configurations to trusted sources only.

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