CVE-2021-26736 | BDVDB-2026-214804 Detail

ZscalerClient Connector

Description#

Multiple vulnerabilities in the Zscaler Client Connector Installer and Uninstaller for Windows prior to 3.6 allowed execution of binaries from a low privileged path. A local adversary may be able to execute code with SYSTEM privileges.

Impact#

CAPEC-234 Hijacking a privileged process

Weaknesses#

CWE-20 Improper Input Validation

References#

https://help.zscaler.com/zscaler-client-connector/client-connector-app-release-summary-2021

Exploit#

No public exploit known

History#

Version 12023-10-23Record published in the CVE List.
Version 22025-02-27Most recent update recorded in the CVE List.

Published

Published: 2023-10-23
Last modified: 2025-02-27

Vendor information

Vendor: Zscaler
Product: Client Connector

All Zscaler vulnerabilities

Score

6.7 Medium

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 13.5.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Improper Input Validation

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
< 3.6
Fixed
3.6

Scoring System

CVSS v4.0

Not available

CVSS v3.1

6.7 Medium

CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H

Metric breakdown
Attack Vector	Local
Attack Complexity	High
Privileges Required	Low
User Interaction	Required
Scope	Unchanged
Confidentiality	High
Integrity	High
Availability	High

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).