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CVE-2026-59566— Local denial-of-service

Quick assessment

Affected
Zscaler Client Connector
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Zscaler Client Connector是美国Zscaler公司的一款实现安全远程访问的网络连接软件。 Zscaler Client Connector Android 4.2之前版本和ChromeOS 4.2之前版本存在输入验证错误漏洞，该漏洞源于缓冲区溢出，可能导致本地拒绝服务攻击。

CVSS 8.4 · High EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 2

VendorProduct Version RangeStatus
Zscaler Client Connector < Android: 4.2 affected
< ChromeOS: 4.2 affected
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I. Basic Information for CVE-2026-59566

Vulnerability Information
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Vulnerability Title
Local denial-of-service
Source: CVE Program / CVE List V5
Vulnerability Description
A locally exploitable buffer overflow bug can cause a local denial-of-service attack on affected versions of Zscaler Client Connector on Android and ChromeOS.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
值处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Zscaler Client Connector 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Zscaler Client Connector是美国Zscaler公司的一款实现安全远程访问的网络连接软件。 Zscaler Client Connector Android 4.2之前版本和ChromeOS 4.2之前版本存在输入验证错误漏洞，该漏洞源于缓冲区溢出，可能导致本地拒绝服务攻击。
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 ~ Android: 4.2 -

II. Public POCs for CVE-2026-59566

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III. Intelligence Information for CVE-2026-59566

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Same Patch Batch · Zscaler · 2026-08-24 · 5 CVEs total

CVE-2026-59564 9.1 CRITICAL Authentication bypass between ZCC and client connector portal
CVE-2026-59568 9.1 CRITICAL Remote Code Execution
CVE-2026-59565 8.8 HIGH Local and kernel denial-of-service
CVE-2026-59567 8.8 HIGH Local privilege escalation

IV. Related Vulnerabilities

Same product: Client Connector
Same vendor: Zscaler
Same weakness: CWE-229

V. Comments for CVE-2026-59566

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