CVE-2025-3935 — ConnectWise ScreenConnect Improper Authentication Vulnerability
CVE-2025-3935: ConnectWise ScreenConnect Improper Authentication Vulnerability
CISA Known Exploited Vulnerability (KEV)
| Vendor / project | ConnectWise |
| Product | ScreenConnect |
| Date added | 2025-06-02 |
| Due date | 2025-06-23 |
| Ransomware campaign use | Unknown |
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.
Required action (CISA)
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Notes
https://www.connectwise.com/company/trust/security-bulletins/screenconnect-security-patch-2025.4 ; https://nvd.nist.gov/vuln/detail/CVE-2025-3935
References
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-3935
- KEV catalog: https://www.cisa.gov/known-exploited-vulnerabilities-catalog