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.
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 4.6.0.457之前版本、4.7.0.317之前版本、4.8.0.232之前版本和4.9.0.372之前版本存在输入验证错误漏洞，该漏洞源于可远程利用的缓冲区溢出，可能导致本地和内核拒绝服务攻击。
Possible ATT&CK Techniques 2 AI
T1499 · Endpoint Denial of Service T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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
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 4.6.0.457之前版本、4.7.0.317之前版本、4.8.0.232之前版本和4.9.0.372之前版本存在输入验证错误漏洞，该漏洞源于可远程利用的缓冲区溢出，可能导致本地和内核拒绝服务攻击。
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 ~ Windows: 4.6.0.457, 4.7.0.317, 4.8.0.232, 4.9.0.372 | - |
|
II. Public POCs for CVE-2026-59565
| # | POC Description | Source Link | Shenlong Link |
|---|
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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 vendor: Zscaler
V. Comments for CVE-2026-59565
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