CVE-2025-3935

ConnectWise ScreenConnect versions 25.2.3 and earlier rely on ASP.NET Web Forms ViewState, whose integrity depends on machine keys; if an attacker with privileged system-level access obtains those keys, they can craft and send a malicious ViewState that the server deserializes, potentially resulting in remote code execution. The risk stems from platform-level ASP.NET behavior rather than a defect introduced by ScreenConnect, and the ScreenConnect Client is not directly impacted, though the CVSS vector (PR:H) confirms exploitation requires already having high privileges on the host. An attacker who achieves this gains code execution on the server with the confidentiality, integrity, and availability impact reflected in the 7.2 High score. ScreenConnect 2025.4 mitigates the issue by disabling ViewState entirely and removing any dependency on it. The flaw was added to CISA's Known Exploited Vulnerabilities catalog on 2025-06-02, indicating confirmed exploitation in the wild, with EPSS estimating a 3.4% chance of exploitation in the next 30 days (88th percentile).

What to do: Upgrade to ScreenConnect 2025.4, which disables ViewState and removes any dependency on it, per vendor instructions and CISA BOD 22-01 requirements; if an upgrade is not immediately possible, apply vendor mitigations or discontinue use of the affected product. Because exploitation requires compromised machine keys, administrators who suspect prior privileged compromise should also review and rotate ASP.NET machine keys and investigate for signs of system-level access. Note ConnectWise is separately rotating ScreenConnect code signing certificates following a nation-state intrusion, so check vendor advisories for related hardening steps.