CVE-2026-102177
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Out-of-Bounds Write in Juniper Junos OS Routing Protocol Daemon

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 adjacent unauthenticated attacker to cause a denial of service when IS-IS link protection and backup-selection are configured.

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Meta Information

Published
2026-10-14
Last Modified
2026-10-14
Generated
2026-11-08
AI Q&A
2026-10-15
EPSS Evaluated
2026-11-07
NVD
CVE-2026-102177
EUVD
EUVD-2026-101393

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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 is an Out-of-bounds Write vulnerability in Juniper Networks Junos OS and Junos OS Evolved. It affects the routing protocol daemon (rpd) when IS-IS link protection and backup-selection are configured. An adjacent unauthenticated attacker could exploit this to cause a denial of service.

Impact Analysis

The vulnerability allows an attacker to disrupt network services by causing a denial of service. This could lead to network outages, degraded performance, or loss of connectivity for affected systems running vulnerable Juniper OS versions.

Compliance Impact

This vulnerability may impact compliance with standards requiring network availability and integrity, such as GDPR (data processing integrity) and HIPAA (network reliability for protected health information). A denial of service could disrupt critical services, potentially violating availability requirements in these regulations.

Mitigation Strategies

Disable IS-IS link protection and backup-selection configurations on affected Juniper Junos OS and Junos OS Evolved systems to prevent exploitation.

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