CVE-2023-41973: Lack of input santization on Zscaler Client Connector enables arbitrary code execution

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-03-26 · updated 2026-06-17
Weakness: CWE-22

Description

ZSATray passes the previousInstallerName as a config parameter to TrayManager, and TrayManager constructs the path and appends previousInstallerName to get the full path of the exe. Fixed Version: Win ZApp 4.3.0.121 and later.

Affected products

Zscaler Client Connector: before 4.3.0.121 — fixed in 4.3.0.121

How to fix

Upgrade to a fixed version: Zscaler Client Connector 4.3.0.121. Check the vendor advisory for mitigations.

References

https://help.zscaler.com/client-connector/client-connector-app-release-summary-2023?applicable_category=Windows&applicable_version=4.3.0.121&deployment_date=2023-09-01&id=1463196
https://help.zscaler.com/client-connector/client-connector-app-release-summary-2023?applicable_category=Windows&applicable_version=4.3.0.121&deployment_date=2023-09-01&id=1463196

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