CVE-2025-3935
CVSS v3
7.2
HIGH
EPSS Score
15.5 %
exploit probability
CISA KEV
Yes
known exploited
Exploitation
—
SSVC status
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.
CISA Known Exploited Vulnerability
- Date Added
- 2025-06-02
- Patch Due Date
- 2025-06-23
- Ransomware Use
- Unknown
Technical details
- Published
- 2025-04-25
Frequently asked questions
What is 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.
Is CVE-2025-3935 actively exploited?
Yes. CVE-2025-3935 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 6/23/2025.
What is the CVSS score for CVE-2025-3935?
CVE-2025-3935 has a CVSS v3 base score of 7.2 (HIGH severity).
Is CVE-2025-3935 affecting your environment?
Use isMalicious to check if any of your IPs or domains are associated with this vulnerability's IOCs.
No credit card required · 30 free checks/month · Free API key
Other 2025 vulnerabilities worth triaging
Ranked by exploit probability (EPSS).