CVE-2026-25687 Zscaler Client Connector - Race Condition

Zscaler Client Connector contains a race condition in the ZPA tunnel handler causing heap corruption, letting attackers cause denial of service or execute arbitrary code, exploit requires no special conditions.

CVSS base score 8.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.38% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Race Condition
Impact
Denial Of Service, Remote Code Execution
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
14 September 2026
Updated
15 October 2026
Weakness
CWE-366

Vendor fix

Update to the latest version of Zscaler Client Connector.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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