You may have recently seen news circulating about a critical security vulnerability, CVE-2025-3935, affecting ConnectWise ScreenConnect. As a trusted IT partner, we want to ensure our customers are fully informed and understand the implications of this threat. We want to assure our clients that Helient Technologies does NOT utilize ConnectWise ScreenConnect.
What is CVE-2025-3935?
At its core, CVE-2025-3935 is a ViewState code injection vulnerability within the ASP.NET Web Forms framework that ScreenConnect uses. In simpler terms, think of ViewState as a hidden area on a web page that keeps track of information as you interact with it. Normally, this information is securely encoded and protected by special "machine keys."
The danger arises if an attacker manages to get their hands on these machine keys. While this requires them to already have privileged system-level access to the server, once they have those keys, they can create and send malicious ViewState data to the website. This malicious data can then trick the server into executing arbitrary code, potentially leading to Remote Code Execution (RCE).
Why is this a big deal?
Remote Code Execution is one of the most severe types of vulnerabilities. If an attacker can execute code on the screenconnect server, they could:
- Completely compromise your system: Gaining full control over the affected server which in turn gives the attacker access to your system directly.
- Access sensitive data: Stealing confidential information, including client data, proprietary secrets, and internal communications.
- Disrupt operations: Causing outages or damaging critical systems.
- Move laterally: Using the compromised server as a jumping-off point to attack other systems within your network.
It's important to note that while this vulnerability affects ScreenConnect, the root cause is a platform-level behavior within ASP.NET, meaning other applications using this framework could also be at risk if not properly secured.
How is Helient Technologies addressing this?
We want to assure our clients that Helient Technologies does NOT utilize ConnectWise ScreenConnect for our internal operations or for managing our clients' systems. This means our own infrastructure and the systems we directly manage are not vulnerable to CVE-2025-3935 through this specific software.
However, we understand that many organizations use remote support tools like ScreenConnect, and this vulnerability poses a significant risk to those who do.
What should you do if you use ScreenConnect?
Most Helient customers do not host or use screen connect directly, but my have vendors that do. The vendor in control of the server needs to mitigate the risks by upgrading their ScreenConnect servers to 25.2.4, cloud hosted servers are being upgraded by ConnectWise directly.
Helient Technologies is here to help!
While we do not use ScreenConnect, we are committed to helping our clients navigate the complex landscape of cybersecurity threats. If you are concerned about CVE-2025-3935, suspect a compromise, or need assistance with your overall cybersecurity posture, Helient proactively contacting our affected Managed Services customers to alert them of their potential risks.
Our team of experts can help you:
- Evaluate your current remote access solutions.
- Perform security assessments to identify vulnerabilities.
- Develop and implement effective patching strategies.
- Strengthen your overall cybersecurity defenses.
- Assist with incident response if you suspect a breach.
Don't let vulnerabilities put your business at risk. Contact our team of experts today to discuss how we can help secure your IT environment.
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