CVE-2026-25687
ZCC race condition in ZPA tunnel handler
CVSS Score
8.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-366 |
| Vendor | zscaler |
| Product | client connector |
| Published | Sep 14, 2026 |
| Last Updated | Sep 15, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
Zscaler / Client Connector
4.6 < 4.6.0.486 4.7 < 4.7.0.350 4.8 < 4.8.0.267 4.9 < 4.9.0.412
References
Credits
GovTech Singapore Red Team