# CVE-2025-3935

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.

- Page: https://www.vulneraibility.com/cve/CVE-2025-3935
- CVSS: 8.1
- Known exploited: yes, in CISA KEV since 2025-06-02; CISA due date 2025-06-23
- EPSS: 3.60%
- CISA SSVC: exploitation active, automatable no, technical impact total (assessed 2025-06-06)
- Weakness: CWE-502
- Published: 2025-04-25

## Affected versions

- ConnectWise ScreenConnect: affected < 25.2.3

A version outside these ranges is not a statement that it is unaffected.

## References

- [other] https://www.connectwise.com/company/trust/security-bulletins/screenconnect-security-patch-2025.4
- [other] https://www.connectwise.com/company/trust/advisories
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-3935

---
Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.