CVE-2025-54983 Health check port on ZCC allows tunnel bypass
A health check port issue in Zscaler Client Connector allows traffic to bypass forwarding controls, undermining security enforcement.
- 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-2025-54983?
CVE-2025-54983 is a medium-severity vulnerability in Zscaler Client Connector, published on 12 Nov 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A health check port on Zscaler Client Connector on Windows, versions 4.6 < 4.6.0.216 and 4.7 < 4.7.0.47, which under specific circumstances was not released after use, allowed traffic to potentially bypass ZCC forwarding controls.
Weakness: CWE-772
Which versions are affected by CVE-2025-54983?
How do I fix CVE-2025-54983?
No fix has been published for CVE-2025-54983 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-54983 being exploited?
There is no known exploitation of CVE-2025-54983 in the wild and no public exploit code.
Sources
Also known as GHSA-x3hh-fgq4-6rqr.