ConnectWise ScreenConnect Improper Authentication Vulnerability (CVE-2025-3935)
Severity: high · Patch status: unknown · Since 2025-06-02 · 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. CISA added CVE-2025-3935 to its Known Exploited Vulnerabilities catalog on Jun 2, 2025, which means attackers are exploiting it in the wild.
What to do
- Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- US federal agencies must remediate by Jun 23, 2025 (BOD 22-01); treat that as the outer limit.
Sources
All live incidents on Threat Watch
