What’s Vulnerable › Vulnerabilities
CVE-2026-25687: ZCC race condition in ZPA tunnel handler
- Severity: high (CVSS 8.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-09-14 · updated 2026-09-18
- Weakness: CWE-366
Description
A race condition in the ZPA tunnel handler of affected versions of Zscaler Client Connector (ZCC) allows a heap corruption, resulting in a denial of service (client crash) and potentially arbitrary code execution in the context of the ZCC process.
Affected products
- Zscaler Client Connector: from 4.6 before 4.6.0.486; from 4.7 before 4.7.0.350; from 4.8 before 4.8.0.267; from 4.9 before 4.9.0.412 — fixed in 4.6.0.486, 4.7.0.350, 4.8.0.267, 4.9.0.412
How to fix
Upgrade to a fixed version: Zscaler Client Connector 4.6.0.486, 4.7.0.350, 4.8.0.267, 4.9.0.412. Check the vendor advisory for mitigations.
References
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