CVE-2026-25687— ZCC race condition in ZPA tunnel handler
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 Zscaler Client Connector (ZCC) 的 ZPA 隧道处理器中存在一个竞态条件，这可能导致堆损坏，进而引发服务中断（客户端崩溃），并有可能在 ZCC 进程的上下文中实现任意代码执行。
Possible ATT&CK Techniques 1 AI
T1210 · Exploitation of Remote Services
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I. Basic Information for CVE-2026-25687
Vulnerability Information
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Vulnerability Title
ZCC race condition in ZPA tunnel handler
Source: CVE Program / CVE List V5
Vulnerability Description
A race condition in the ZPA tunnel handler of affected versions of Zscaler Client Connector (ZCC) allows a heap corruption, resulting in a denial of service (client crash) and potentially arbitrary code execution in the context of the ZCC process.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
单线程内的竞争条件
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Zscaler | Client Connector | 4.6 ~ 4.6.0.486 | - |
|
II. Public POCs for CVE-2026-25687
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Same Patch Batch · Zscaler · 2026-09-14 · 3 CVEs total
| CVE-2026-59569 | 8.1 HIGH | Android ZCC VPN API method privilege escalation |
| CVE-2026-59570 | 7.5 HIGH | Android ZCC denial of service |
IV. Related Vulnerabilities
V. Comments for CVE-2026-25687
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