Race Condition Vulnerability in Zscaler Client Connector
CVE-2026-25687

8.1HIGH

Key Information:

Vendor

Zscaler

Status
Client Connector
Vendor
CVE Published:
14 September 2026

What is CVE-2026-25687?

A race condition in the Zscaler Client Connector's tunnel handler can lead to heap corruption, causing a denial of service where the client may crash. This vulnerability poses a risk of arbitrary code execution in the context of the Zscaler Client Connector process, potentially allowing attackers to execute malicious actions.

Affected Version(s)

Client Connector Windows 4.6 < 4.6.0.486

Client Connector Windows 4.7 < 4.7.0.350

Client Connector Windows 4.8 < 4.8.0.267

References

https://help.zscaler.com/zscaler-client-connector/client-...

CVSS V3.1

Score:
8.1
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

GovTech Singapore Red Team
.