CVE-2026-102031

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OS Command Injection in Juniper Networks Junos OS Evolved TACACS

Publication date: 2026-10-14

Last updated on: 2026-10-16

Assigner: Juniper Networks, Inc.

Description

An OS Command Injection vulnerability in TACACS of Juniper Networks Junos OS Evolved allows a low-privileged TACACS+-authenticated user to execute commands with root privileges when periodic TACACS+ authorization-refresh is enabled.

CVSS Scores

EPSS Scores

Probability:
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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-2026-102031

EUVD

EUVD-2026-101356

Affected Vendors & Products

Vendor	Product	Version / Range
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

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-78	The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.

Attack-Flow Graph

Executive Summary

This vulnerability is an OS Command Injection flaw in the TACACS authentication system of Juniper Networks Junos OS Evolved. It allows a low-privileged user authenticated via TACACS+ to execute commands with root privileges when periodic TACACS+ authorization-refresh is enabled.

Detection Guidance

Detecting this vulnerability requires checking if periodic TACACS+ authorization-refresh is enabled on Juniper Networks Junos OS Evolved systems. Review TACACS+ configuration files for the 'authorization-refresh' setting. Monitor logs for unusual command execution by low-privileged users during refresh intervals.

Impact Analysis

An attacker could gain full control over the affected system, allowing them to execute arbitrary commands as root. This could lead to unauthorized access, data theft, system compromise, or disruption of services.

Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, which may violate compliance requirements under GDPR, HIPAA, or other regulations. Organizations may face legal penalties, reputational damage, and loss of trust due to non-compliance.

Mitigation Strategies

Disable periodic TACACS+ authorization-refresh on affected Juniper Junos OS Evolved systems to prevent command execution with root privileges.

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