What’s Vulnerable › Vulnerabilities
CVE-2025-20206: Cisco Secure Client for Windows with VPN Posture (HostScan) Module DLL Hijacking Vulnerability
- Severity: high (CVSS 7.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2025-03-05 · updated 2026-06-17
- Weakness: CWE-347
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.
Affected products
- Cisco Secure Client: before 5.1.8.105 — fixed in 5.1.8.105
How to fix
Upgrade to a fixed version: Cisco Secure Client 5.1.8.105. Check the vendor advisory for mitigations.
References
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