CVE-2021-26737 Privilege Escalation Using PID Reuse in ZCC macOS

Medium 5.5 Published 23 Oct 2023 Updated 11 Sep 2024

A local attacker can exploit a race condition to shut down the Zscaler tunnel, causing a denial of service.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-26737?

CVE-2021-26737 is a medium-severity vulnerability in Zscaler Client Connector, published on 23 Oct 2023. It can only be exploited from the same machine or local network, with no action from the victim.

Official 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.

Weakness: CWE-346

Which versions are affected by CVE-2021-26737?

It affects 1 product.

Products include Zscaler Client Connector.

How do I fix CVE-2021-26737?

No fix has been published for CVE-2021-26737 yet. Limit exposure of the affected software until one is available.

Is CVE-2021-26737 being exploited?

There is no known exploitation of CVE-2021-26737 in the wild and no public exploit code.

Sources

Also known as GHSA-7x29-jh5v-6wwf.