ConnectWise ScreenConnect Improper Authentication Vulnerability
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.
- Vendor
- ConnectWise
- Product
- ScreenConnect
- CVSS
- 8.1
- EPSS (exploit probability)
- 3.5%
- Status
- kev
- CISA patch-by (BOD 22-01)
- Added to KEV
Is CVE-2025-3935 being exploited?
Yes. CISA added CVE-2025-3935 to its Known Exploited Vulnerabilities catalog on . CISA only lists a CVE when it has reliable evidence of exploitation in the wild.
FIRST's EPSS model puts the probability of exploitation activity in the next 30 days at 3.5% (scored October 16, 2026).
- CISA KEV[ LISTED ]
- ENISA EUVD (exploited)[ — ]
- CIRCL KEV[ — ]
Catalog snapshot 2026-10-21. Full cross-catalog view: /kev-comparison
What to do
CISA required actionApply 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 civilian agencies must remediate by (21 days after listing) under BOD 22-01. Everyone else: that deadline is a sensible upper bound, not a target. Vendor guidance and the NVD record are linked under Source above.
Other ConnectWise ScreenConnect CVEs we track
| CVE / Vulnerability | Severity | CVSS | EPSS | Added to KEV |
|---|---|---|---|---|
| CVE-2026-84869 ConnectWise ScreenConnect Improper Privilege Management and Missing Authorization Vulnerabilitywrite-up | [ CRITICAL ] | 9.9 | 0.9% | |
| CVE-2024-1708 ConnectWise ScreenConnect Path Traversal Vulnerabilityransomware use | [ HIGH ] | 8.4 | 95.4% | |
| CVE-2024-1709 ConnectWise ScreenConnect Authentication Bypass Vulnerabilityransomware use | [ CRITICAL ] | 10.0 | 100.0% |