Description
ScreenConnect versions 25.2.3 and earlier versions may be susceptible to a ViewState code injection attack. ASP.NET Web Forms use ViewState to preserve page and control state, with data encoded using Base64 protected by machine keys. It is important to note that to obtain these machine keys, privileged system level access must be obtained. If these machine keys are compromised, attackers could create and send a malicious ViewState to the website, potentially leading to remote code execution on the server. The risk does not originate from a vulnerability introduced by ScreenConnect, but from platform level behavior. This had no direct impact to ScreenConnect Client. ScreenConnect 2025.4 patch disables ViewState and removes any dependency on it.
CISA Known Exploited Vulnerability
Date added 2025-06-02 | Due date 2025-06-23
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Problem types
CWE-502 Deserialization of Untrusted Data
Product status
<25.2.3
References
www.cisa.gov/...nerabilities-catalog?field_cve=CVE-2025-3935
www.connectwise.com/...s/screenconnect-security-patch-2025.4
www.connectwise.com/company/trust/advisories