CVE-2021-26735— Untrusted Search Path While Executing REG DELETE by Uninstaller
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I. Basic Information for CVE-2021-26735
Vulnerability Information
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Vulnerability Title
Untrusted Search Path While Executing REG DELETE by Uninstaller
Source: NVD (National Vulnerability Database)
Vulnerability Description
The Zscaler Client Connector Installer and Unsintallers for Windows prior to 3.6 had an unquoted search path vulnerability. A local adversary may be able to execute code with SYSTEM privileges.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
源验证错误
Source: NVD (National Vulnerability Database)
Vulnerability Title
Zscaler Client Connector 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Zscaler Client Connector是zscaler的一个应用软件。一种安装在设备上的应用程序，可确保互联网流量和对组织内部应用程序的访问是安全的并符合组织的政策，即使不在公司网络时。 Zscaler Client Connector 3.6之前版本存在安全漏洞。攻击者利用该漏洞能够使用系统权限执行代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Zscaler | Client Connector | 0 ~ 3.6 | - |
II. Public POCs for CVE-2021-26735
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Zscaler · 2023-10-23 · 12 CVEs total
| CVE-2023-28804 | 8.2 HIGH | Linux ZCC allows unsigned updates, allowing elevated Code Execution |
| CVE-2021-26738 | 7.8 HIGH | Privilege Escalation for ZCC macOS via PATH Variable |
| CVE-2023-28793 | 7.8 HIGH | Heap Based Buffer Overflow in Library |
| CVE-2023-28795 | 7.8 HIGH | Client IPC validation bypass |
| CVE-2023-28796 | 7.1 HIGH | IPC Bypass Through PLT Section in ELF |
| CVE-2021-26736 | 6.7 MEDIUM | ZApp Installer Privilege Escalation Vulnerabilities |
| CVE-2023-28805 | 6.7 MEDIUM | ZCC on Linux privilege escalation |
| CVE-2023-28797 | 6.3 MEDIUM | LPE using arbitrary file delete with Symlinks |
| CVE-2023-28803 | 5.9 MEDIUM | Traffic being bypassed by ZCC by configuring synthetic IP range as local network |
| CVE-2021-26737 | 5.5 MEDIUM | Privilege Escalation Using PID Reuse in ZCC macOS |
| CVE-2021-26734 | 4.4 MEDIUM | Junction Delete leading to elevation of privilege |
IV. Related Vulnerabilities
Same product: Client Connector
- CVE-2024-31127
MacOS Zscaler Client Connector Local Privilege Escalation - CVE-2023-28806
Signature validation error in DLL allows disabling anti-tamp - CVE-2024-23483
Local Privilege Escalation via lack of input validation - CVE-2024-23460
Incorrect signature validation of package - CVE-2024-23464
Zscaler bypass with administrative privileges on Windows
Same weakness: CWE-346
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RCE in TUBITAK BILGEM's Liderahenk - CVE-2026-43870
Apache Thrift: Node.js web_server.js multi-vulnerability - CVE-2026-7439
AgentFlow Local Web API Content-Type Validation Bypass - CVE-2026-41398
OpenClaw - Unauthorized Agent Request Dispatch via Untrusted - CVE-2026-41393
OpenClaw < 2026.3.31 - Arbitrary DNS Authority Acceptance an
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