Known Exploited Vulnerabilities CVE-2025-3935

ConnectWise ScreenConnect contains an improper authentication vulnerability. This vulnerability could allow a ViewState code injection attack, which could allow remote code execution if machine keys are compromised.

Mappings

Capability ID Capability Description Mapping Type ATT&CK ID ATT&CK Name Notes
CVE-2025-3935 ConnectWise ScreenConnect Improper Authentication Vulnerability exploitation_technique T1203 Exploitation for Client Execution
Comments
By exploiting this vulnerability, which stems from ASP.NET and its use of ViewState, an attacker with privileged access can gain access to sensitive data, such as machine keys. By using these machine keys, the attacker can craft malicious ViewState payloads to execute remote code on the ScreenConnect server.
References
CVE-2025-3935 ConnectWise ScreenConnect Improper Authentication Vulnerability primary_impact T1059 Command and Scripting Interpreter
Comments
By exploiting this vulnerability, which stems from ASP.NET and its use of ViewState, an attacker with privileged access can gain access to sensitive data, such as machine keys. By using these machine keys, the attacker can craft malicious ViewState payloads to execute remote code on the ScreenConnect server.
References