CVE-2025-3935
ScreenConnect Exposure to ASP.NET ViewState Code Injection
Basic Information
- CVE State
- PUBLISHED
- Reserved Date
- April 25, 2025
- Published Date
- April 25, 2025
- Last Updated
- February 26, 2026
- Vendor
- ConnectWise
- Product
- ScreenConnect
- 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.
- Tags
- Score
- 12.03% (Percentile: 93.91%) as of 2026-05-31
- Exploitation
- active
- Technical Impact
- total
- Exploited in the Wild
- Yes (2026-06-01 10:31:20 UTC) Source
dotnet
cisa
CVSS Scores
CVSS v3.1
8.1 - HIGH
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score
SSVC Information
Exploit Status
References
Known Exploited Vulnerability Information
| Source | Added Date |
|---|---|
| CVE | 2026-06-01 10:31:13 UTC |
Timeline
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CVE ID Reserved
-
CVE Published to Public
-
Added to KEVIntel