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TI-2025-03479 Aliases CVE-2025-3935GHSA-qjrp-xr9r-wmrg

ScreenConnect Exposure to ASP.NET ViewState Code Injection

Priority CRITICAL 94Exploited in the wildCWE-502Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-502.

Summary

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.

Why it matters now

Exploitation Active In CISA KEV since 2025-06-02CISA due date 2025-06-23
EPSS 0.03597 89th percentileScored 2026-11-07
Fix Fixed ScreenConnect (ConnectWise): 25.2.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Active
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ConnectWiseScreenConnectbefore 25.2.325.2.3Patch availableCNA
  • ScreenConnect VendorConnectWise Affected before 25.2.3 Fixed in 25.2.3 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:connectwise:screenconnect:*:*:*:*:*:*:*:*before 25.2.4VulnerableConnectWise
  • cpe:2.3:a:connectwise:screenconnect:*:*:*:*:*:*:*:* Versions before 25.2.4 Vulnerable ·ConnectWise

Remediation

  • Fix · CNA ScreenConnect (ConnectWise) Fixed in 25.2.3

Timeline

  1. 2025-06-02 Added to CISA KEV
  2. 2026-10-02 Threatist record created from CVE-2025-3935
  3. 2026-10-03 Alias added: GHSA-qjrp-xr9r-wmrg

References

Advisory 2

  • TI-2026-58346 ScreenConnect Client: Guest-to-Host File Execution via File-Transfer Actions KEVCVSS 3.1CRITICAL 9.9
  • TI-2024-01589 Authentication bypass using an alternate path or channel KEVCVSS 3.1CRITICAL 10.0
  • TI-2024-01588 Improper limitation of a pathname to a restricted directory (“path traversal”) KEVCVSS 3.1HIGH 8.4
  • TI-2025-13036 Improper server-side validation in ScreenConnect extension framework CVSS 3.1CRITICAL 9.1
  • TI-2023-25574 ConnectWise ScreenConnect through 23.8.4 allows man-in-the-middle attackers to achieve… CVSS 3.1HIGH 8.1
  • TI-2025-13525 Certificate Signing Extension Returns Encrypted Values CVSS 3.1MEDIUM 5.3
See all 9 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences