June 2, 2025 · Applied Cybernetics Group
CVE-2025-3935 — ConnectWise ScreenConnect
ConnectWise ScreenConnect Improper Authentication Vulnerability
- Added to KEV
2025-06-02- Federal due date
2025-06-23- Vendor
- ConnectWise
- Product
- ScreenConnect
- EPSS
- 87.1th percentile (score 0.033, as of
2026-07-13) - NVD CVSS v3.1
- —
- Ransomware use
- Unknown
- ATT&CK
- T1059 , T1203 · signal rollup
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2025-3935
CISA short 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
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.