Critical severity9.8NVD Advisory· Published Jul 15, 2021· Updated Jun 17, 2026

CVE-2020-11633

Description

The Zscaler Client Connector for Windows prior to 2.1.2.74 had a stack based buffer overflow when connecting to misconfigured TLS servers. An adversary would potentially have been able to execute arbitrary code with system privileges.

Affected products

Zscaler/Client Connector2 versions
cpe:2.3:a:zscaler:client_connector:*:*:*:*:*:windows:*:*+ 1 more
- cpe:2.3:a:zscaler:client_connector:*:*:*:*:*:windows:*:*range: <2.1.2.81
- (no CPE)
Zscaler/Zscaler Client Connector Installerllm-fuzzy
Range: <2.1.2.74

Patches

Vulnerability mechanics

References

help.zscaler.com/zscaler-client-connector/client-connector-app-release-summary-2020nvdVendor Advisory

News mentions

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cvss	0.637
epss	0.002
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000