CVE-2021-26737: Zscaler Client Connector

Medium severity, CVSS 4.7. EPSS: 0.1% chance of exploitation in the next 30 days.

The Zscaler Client Connector for macOS prior to 3.6 did not sufficiently validate RPC clients. A local adversary without sufficient privileges may be able to shutdown the Zscaler tunnel by exploiting a race condition.

Affected products

• Zscaler Client Connector: before 3.6 (fixed in 3.6)

Published 2023-10-23. Last modified 2026-06-17.