CVE-2025-3935—ConnectWise ScreenConnect Improper Authentication Vulnerability

Vulnerability Name

ConnectWise ScreenConnect Improper Authentication Vulnerability

Description

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.

Known To Be Used in Ransomware Campaigns?

Ransomware Status:

Unknown

Action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Additional Notes

• https://www.connectwise.com/company/trust/security-bulletins/screenconnect-security-patch-2025.4
• https://nvd.nist.gov/vuln/detail/CVE-2025-3935

Related News Articles

• ConnectWise patches new flaw allowing ScreenConnect hijackingMarch 18, 2026
• CISA Orders Immediate Patch of Critical Sitecore Vulnerability Under Active ExploitationSeptember 5, 2025
• ConnectWise to Rotate ScreenConnect Code Signing Certificates Due to Security RisksJune 12, 2025
• CISA warns of ConnectWise ScreenConnect bug exploited in attacksJune 3, 2025

Related Weaknesses

• CWE-287