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CVE-2025-20206— Cisco Secure Client for Windows with VPN Posture (HostScan) Module DLL Hijacking Vulnerability

Quick assessment

Affected
Cisco Cisco Secure Client
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.

Cisco Secure Client是美国思科（Cisco）公司的一个用于连接虚拟专用网络的软件。 Cisco Secure Client存在数据伪造问题漏洞，该漏洞源于运行时资源验证不足，从而导致DLL劫持攻击。

CVSS 7.1 · High EPSS 0.18% · P7
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I. Basic Information for CVE-2025-20206

Vulnerability Information
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Vulnerability Title
Cisco Secure Client for Windows with VPN Posture (HostScan) Module DLL Hijacking Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the interprocess communication (IPC) channel of Cisco Secure Client for Windows could allow an authenticated, local attacker to perform a DLL hijacking attack on an affected device if the Secure Firewall Posture Engine, formerly HostScan, is installed on Cisco Secure Client. This vulnerability is due to insufficient validation of resources that are loaded by the application at run time. An attacker could exploit this vulnerability by sending a crafted IPC message to a specific Cisco Secure Client process. A successful exploit could allow the attacker to execute arbitrary code on the affected machine with SYSTEM privileges. To exploit this vulnerability, the attacker must have valid user credentials on the Windows system.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco Secure Client 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco Secure Client是美国思科（Cisco）公司的一个用于连接虚拟专用网络的软件。 Cisco Secure Client存在数据伪造问题漏洞，该漏洞源于运行时资源验证不足，从而导致DLL劫持攻击。
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
Cisco Cisco Secure Client 4.9.00086 -

II. Public POCs for CVE-2025-20206

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III. Intelligence Information for CVE-2025-20206

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Vendor Advisories for CVE-2025-20206 (1)

IV. Related Vulnerabilities

Same product: Cisco Secure Client
Same vendor: Cisco
Same weakness: CWE-347

V. Comments for CVE-2025-20206

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