ConnectWise ScreenConnect Improper Authentication Vulnerability

Technical Severity

CVSS v3.1 Metrics

HIGH

8.1 / 10

Minimal Risk Critical

Vector Specification

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitation Likelihood

EPSS Prediction

15.50 %

Predictive Probability

Percentile Rank

94.6 th

Documented as more likely to be exploited than 94.6% of known CVEs.

Detection Date

Jun 02, 2025

Remediation Due

Jun 23, 2025

CISA Catalog Active

Threat Analysis

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.

Remediation Directive

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

External Intelligence

https://www.connectwise.com/company/trust/security-bulletins/screenconnect-security-patch-2025.4

NVD

National Vulnerability Database

https://nvd.nist.gov/vuln/detail/CVE-2025-3935