CVE-2026-66153

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Insecure File Path Handling in SonicWall NetExtender Linux Client

Publication date: 2026-08-25

Last updated on: 2026-08-27

Assigner: SonicWALL, Inc.

Description

The NEService auto-upgrade process insecurely handles temporary files in SonicWall NetExtender Linux client which allows an attacker to manipulate file paths.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-08-25

Last Modified

2026-08-27

Generated

2026-09-15

AI Q&A

2026-08-25

EPSS Evaluated

2026-09-13

NVD

CVE-2026-66153

Affected Vendors & Products

Vendor	Product	Version / Range
sonicwall	netextender	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-59	The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

Attack-Flow Graph

Executive Summary

This vulnerability involves the NEService auto-upgrade process in the SonicWall NetExtender Linux client. It insecurely handles temporary files, allowing an attacker to manipulate file paths during the upgrade process.

Detection Guidance

This vulnerability involves insecure handling of temporary files in SonicWall NetExtender Linux client. Detection may require inspecting file operations during the auto-upgrade process. Check for unexpected file modifications or path manipulations in temporary directories like /tmp or /var/tmp. Monitor processes spawned by NetExtender for unusual file access patterns.

Impact Analysis

An attacker could exploit this to replace legitimate files with malicious ones during an upgrade, potentially leading to unauthorized code execution or system compromise on the affected Linux client.

Compliance Impact

The vulnerability involves insecure handling of temporary files in the auto-upgrade process, which could allow file manipulation. This may lead to unauthorized access or modification of sensitive data, potentially violating GDPR (data protection) and HIPAA (health data security) compliance requirements for confidentiality and integrity.

Mitigation Strategies

Disable the NEService auto-upgrade process in SonicWall NetExtender Linux client until a patch is available. Monitor SonicWall's official advisories for updates and apply patches immediately when released.

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