vulnerability

Zscaler Client Connector: CVE-2021-26737: Origin Validation Error

Try Surface Command

Back to search

Severity

CVSS

(AV:L/AC:L/Au:S/C:N/I:N/A:C)

Published

Oct 23, 2023

Added

Jun 5, 2025

Modified

Jun 17, 2026

Description

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.

Solution

zscaler-client-connector-update-latest

References

CVE-2021-26737
https://attackerkb.com/topics/CVE-2021-26737
CWE-346
EUVD-EUVD-2021-13524
https://euvd.enisa.europa.eu/vulnerability/EUVD-2021-13524

Rapid7 Labs

2026 Global Threat Landscape Report

The predictive window has collapsed. Exploitation follows disclosure in days. See how attackers are accelerating and how to stay ahead.

Get report