Connectwise: >> Screenconnect Security Vulnerabilities
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.
Known exploited
CVSS Score
8.1
EPSS Score
0.201
Published
2025-04-25
ConnectWise ScreenConnect 23.9.7 and prior are affected by path-traversal vulnerability, which may allow an attacker
the ability to execute remote code or directly impact confidential data or critical systems.
CVSS Score
8.4
EPSS Score
0.493
Published
2024-02-21
CVE-2024-1709
ConnectWise ScreenConnect 23.9.7 and prior are affected by an Authentication Bypass Using an Alternate Path or Channel
vulnerability, which may allow an attacker direct access to confidential information or
critical systems.
Known exploited
CVSS Score
10.0
EPSS Score
0.943
Published
2024-02-21
ConnectWise ScreenConnect through 23.8.4 allows local users to connect to arbitrary relay servers via implicit trust of proxy settings
CVSS Score
5.5
EPSS Score
0.001
Published
2024-02-01
ConnectWise ScreenConnect through 23.8.4 allows man-in-the-middle attackers to achieve remote code execution via crafted messages.
CVSS Score
8.1
EPSS Score
0.05
Published
2024-02-01
ConnectWise ScreenConnect versions 22.6 and below contained a flaw allowing potential brute force attacks on custom access tokens due to inadequate rate-limiting controls in the default configuration. Attackers could exploit this vulnerability to gain unauthorized access by repeatedly attempting access code combinations. ConnectWise has addressed this issue in later versions by implementing rate-limiting controls as a preventive measure against brute force attacks.
CVSS Score
5.3
EPSS Score
0.001
Published
2022-09-28