Always On VPN Security Updates July 2025

Patch Tuesday has arrived, and, unlike last month, it’s a busy month for Always On VPN administrators. The June 2025 Microsoft security updates address a whopping 16 (!) vulnerabilities in the Windows Routing and Remote Access Service (RRAS). Notably, DirectAccess administrators are once again impacted by a critical vulnerability in the Windows KDC Proxy Service (KPSSVC) this month.

RRAS

As stated previously, this month’s update addresses 16 unique CVEs in Windows Server RRAS. All are memory-related buffer overflows and out-of-bounds reads, indicating that a security researcher was recently probing for vulnerabilities in RRAS.

While all the above CVEs are Remote Code Execution (RCE) and Information Disclosure vulnerabilities, none are rated as Critical; all are rated as Important. This means exploitation is unlikely, but administrators are encouraged to update as soon as possible.

KDC Proxy

This month’s security update includes another Critical RCE in the Windows KDC Proxy Service (KPSSVC).

The KDC Proxy is enabled by default when DirectAccess is configured. By design, this means the service is exposed to the public Internet, posing a significant risk to organizations using DirectAccess for secure remote access. Administrators are urged to update their systems immediately to avoid compromise.

Additional Information

Microsoft July 2025 Security Updates

Always On VPN Discord Channel

I’m excited to announce the launch of a brand-new Discord channel dedicated to administrators working with Always On VPN! Whether you’re a seasoned pro or just getting started, this community is designed to be your go-to hub for collaboration, troubleshooting, and staying up to date on all things Always On VPN. The channel was established by my good friend Leo D’Arcy, the creator of the popular Always On VPN Dynamic Profile Generator (DPC) software.

Why Discord?

Always On VPN is a powerful solution for secure, seamless remote connectivity, but managing it comes with its own set of challenges. From configuration quirks to deployment strategies, administrators often need a space to share insights, ask questions, and learn from one another in real time. That’s where our new Discord channel comes in.

Community Forum

Discord offers a dynamic, user-friendly platform for instant communication and community building. Unlike forums or email threads, it’s a place where you can start a conversation, jump into live discussions, share resources, ask questions, share important insights or experiences, and much more.

Channels

Today, the Always On VPN Discord channel is part of the Microsoft Remote Access User Group Discord Server. It consists of multiple channels divided into the following topics.

General – This is a great place to introduce yourself and say hello to everyone!

DPC-Development – Here, you can ask questions about DPC, provide feedback, and suggest new features and functionality.

DPC-Chat – This channel is for administrators to discuss all things DPC, including deployment strategies, operation, support, and more.

Aovpn-Chat – If you’ve deployed Always On VPN but aren’t using DPC, this is your channel! Although DPC is fantastic, not everyone is using it. In this channel, you can submit questions and share general information about Always On VPN.

Gsa-Chat – We’ve also included a Microsoft Entra Global Secure Access channel for the new Microsoft Security Service Edge (SSE) solution, which includes Entra Private Access. This channel is pretty quiet right now. Hopefully, it will grow in the future!

DirectAccess-Chat – Yes, we realize some of you are still running DirectAccess, so there’s also a channel for you! Feel free to drop in and ask questions here, hopefully about migrating soon. 😉

Who Is This For?

This channel is open to anyone managing Microsoft secure remote access products. Whether you’re an IT administrator in a small business, an enterprise network engineer, or a consultant helping clients stay connected. If you’re working with Microsoft remote access technologies, this is the place to be!

Why Not Reddit?

Funny story: I tried to create an Always On VPN subreddit a few years ago. It lasted one day before it was banned! No reason was given, and I couldn’t get anyone from Reddit to respond. I answer questions ad hoc on Reddit all the time, but there’s no dedicated space for Always On VPN or Microsoft remote access in general.

How To Join

Joining our Discord channel is easy.

  1. Click this link.
  2. Set up your Discord account if you don’t already have one. It’s free and only takes a minute!
  3. Optionally, you can download the Discord app here.
  4. Say hello and introduce yourself in the #general channel.
  5. Explore the other channels, ask questions, give feedback, and share your expertise!

See You There!

Leo and I, along with many other experienced Always On VPN administrators, are on the forums daily. We encourage you to share your expertise, ask questions, and help others along the way. The more we contribute, the stronger this resource becomes for everyone. Join us today!

Additional Information

Always On VPN Discord Channel

Always On VPN Dynamic Profile Configurator (DPC)

DPC on GitHub

November 2024 Microsoft Security Updates and DirectAccess

With the November 2024 security updates, Microsoft disclosed a vulnerability (CVE-2024-43639) in the Windows Server KDC Proxy service. This is a Remote Code Execution (RCE) vulnerability with a max severity rating of Critical. If you still use Microsoft DirectAccess for remote access, you’ll want to pay close attention to this bulletin.

KDC Proxy and DirectAccess

When DirectAccess is installed and configured, the KDC Proxy Service is enabled automatically and by default. By design, DirectAccess servers are exposed to the Internet, which significantly increases the risk of this vulnerability. Organizations that have deployed DirectAccess are encouraged to update their systems immediately.

Workaround

There is no known workaround available at this time. Apply the latest security updates to mitigate this risk.

Additional Information

Windows KDC Proxy Remote Code Execution Vulnerability

Microsoft DirectAccess Formally Deprecated