CVE-2026-33789
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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: 2026-10-15

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 an unauthenticated BGP peer to cause a denial of service and potential root-level command execution via crafted BGP route updates when the BGP Monitoring Protocol (BMP) is enabled.

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Meta Information

Published
2026-10-14
Last Modified
2026-10-15
Generated
2026-10-19
AI Q&A
2026-10-15
EPSS Evaluated
2026-10-18
NVD
CVE-2026-33789
EUVD
EUVD-2026-101401

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 is a Stack-based Buffer Overflow vulnerability in Juniper Networks Junos OS and Junos OS Evolved. It occurs in the routing protocol daemon (rpd) and can be triggered by an unauthenticated BGP peer sending crafted BGP route updates when the BGP Monitoring Protocol (BMP) is enabled. This may lead to a denial of service and potential root-level command execution.

Detection Guidance

Detecting this vulnerability requires checking for the presence of the BGP Monitoring Protocol (BMP) feature and monitoring for unusual BGP route updates. Inspect Junos OS configurations for BMP settings using show configuration protocols bmp. Monitor rpd logs for crashes or anomalies with show log messages | match rpd. Check for unexpected BGP peer connections or route updates with show bgp neighbor and show route advertising-protocol bgp.

Impact Analysis

An attacker could exploit this to crash the routing protocol daemon, causing network disruption. In severe cases, it may allow arbitrary code execution with root privileges, leading to full system compromise and unauthorized access to sensitive data or network control.

Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, violating confidentiality requirements in GDPR and HIPAA. Organizations may face compliance violations, legal penalties, and reputational damage due to potential exposure of sensitive data.

Mitigation Strategies

Disable BGP Monitoring Protocol (BMP) if enabled. Update Junos OS or Junos OS Evolved to the latest patched version. Restrict BGP peer connections to trusted sources only.

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