CVE-2025-3935

HIGH8.1

CISA KEV

Published 2025-04-25 · Updated 2026-06-17 · Source 7d616e1a-3288-43b1-a0dd-0a65d3e70a49

Summary

CVE-2025-3935 is a high-severity (CVSS 8.1) vulnerability in ConnectWise ScreenConnect. CISA added it to the Known Exploited Vulnerabilities catalog on June 2, 2025, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by June 23, 2025. CISA does not currently list it as used in ransomware campaigns. ConnectWise has 4 vulnerabilities in the KEV catalog, 2 of them linked to ransomware.

All 4 known-exploited ConnectWise vulnerabilities →

Description

ScreenConnect versions 25.2.3 and earlier versions may be susceptible to a ViewState code injection attack. ASP.NET Web Forms use ViewState to preserve page and control state, with data encoded using Base64 protected by machine keys. It is important to note that to obtain these machine keys, privileged system level access must be obtained. If these machine keys are compromised, attackers could create and send a malicious ViewState to the website, potentially leading to remote code execution on the server. The risk does not originate from a vulnerability introduced by ScreenConnect, but from platform level behavior. This had no direct impact to ScreenConnect Client. ScreenConnect 2025.4 patch disables ViewState and removes any dependency on it.

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

CWE-502

CISA Known-Exploited Vulnerability

Product: ConnectWise — ScreenConnect

Name: ConnectWise ScreenConnect Improper Authentication Vulnerability

Date added: 2025-06-02 · Due: 2025-06-23

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.

References

View on NVD

More exploited ConnectWise vulnerabilities

Most recently added to CISA KEV

CVE-2026-84869
ScreenConnect — ConnectWise ScreenConnect Improper Privilege Management and Missing Authorization Vulnerability
added 2026-09-11
CVE-2024-1708
RANSOMWARE
ScreenConnect — ConnectWise ScreenConnect Path Traversal Vulnerability
added 2026-04-28
CVE-2024-1709
RANSOMWARE
ScreenConnect — ConnectWise ScreenConnect Authentication Bypass Vulnerability
added 2024-02-22

View all →

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