CVE-2025-3935

HIGHCISA KEV

8.1

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.

CVE Details

CVSS v3.1 Score8.1

SeverityHIGH

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

Attack VectorNETWORK

ComplexityHIGH

Privileges RequiredNONE

User InteractionNONE

Published4/25/2025

Last Modified10/24/2025

Sourcekev

Honeypot Sightings0

CISA KEV

VendorConnectWise

ProductScreenConnect

Vulnerability NameConnectWise ScreenConnect Improper Authentication Vulnerability

KEV Date Added2025-06-02

Remediation Due Date2025-06-23

Ransomware UseUnknown

Affected Products

connectwise:screenconnect

Weaknesses (CWE)

CWE-502

References

https://www.connectwise.com/company/trust/advisories(7d616e1a-3288-43b1-a0dd-0a65d3e70a49)

https://www.connectwise.com/company/trust/security-bulletins/screenconnect-security-patch-2025.4(7d616e1a-3288-43b1-a0dd-0a65d3e70a49)

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-3935(134c704f-9b21-4f2e-91b3-4a467353bcc0)

IOC Correlations

No correlations recorded

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