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CVE-2026-59565— Local and kernel 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.

在受影响版本的 Windows 平台 Zscaler Client Connector 中，存在一个可通过远程利用的缓冲区溢出漏洞，可能导致本地及内核级的拒绝服务（DoS）攻击。

CVSS 8.8 · High EPSS 0.27% · P19

Affected Version Matrix 1

VendorProduct Version RangeStatus
Zscaler Client Connector < Windows: 4.6.0.457, 4.7.0.317, 4.8.0.232, 4.9.0.372 affected
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I. Basic Information for CVE-2026-59565

Vulnerability Information
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Vulnerability Title
Local and kernel denial-of-service
Source: CVE Program / CVE List V5
Vulnerability Description
A remotely exploitable buffer overflow bug can cause a local and kernel denial-of-service attack on affected versions of Zscaler Client Connector on Windows.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Zscaler Client Connector 0 ~ Windows: 4.6.0.457, 4.7.0.317, 4.8.0.232, 4.9.0.372 -

II. Public POCs for CVE-2026-59565

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III. Intelligence Information for CVE-2026-59565

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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-2026-59567 8.8 HIGH Local privilege escalation
CVE-2026-59566 8.4 HIGH Local denial-of-service

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-59565

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