Cloud Software Group continues to investigate any potential impact on Cloud Software Group-managed cloud services. If, as the investigation continues, any Cloud Software Group-managed services are found to be affected by this issue, Cloud Software Group will take immediate action to remediate the problem. Customers using Cloud Software Group-managed cloud services do not need to take any action.
 
Cloud Software Group has investigated the potential impact on customer-managed (on-premises) products. Please see the status of these products below.

Instructions to disable HTTP/2 using Internet Information Services (IIS) Manager: 

HTTP/2 is enabled by default in IIS 10.0+ for HTTPS connections. There are a number of ways to disable IIS.

Option 1 – Disable HTTP/2 in IIS

1. Open Internet Information Services (IIS) Manage

2. In the left hand Connections pane, navigate to the website

3. In the Actions pane, select Bindings

4. Select https then Edit

5. Select Disable HTTP/2

Option 2 – Disable HTTP/2 using netsh

You can use the command netsh with parameter disablehttp2 to disable http2.

1. Open an elevated command prompt

2. To view the current configuration, run:

netsh http show sslcert

3. To disable HTTP/2, run:

netsh http update sslcert disablehttp2=enable ipport=[IP:Port] certhash=[Certificate Hash] appid="[Application ID]"

Where [IP:Port], [Certificate Hash] and [Application ID] are taken from the current configuration.

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Changelog

Cloud Software Group is aware of the report describing the MadeYouReset HTTP/2 Vulnerability.

The MadeYouReset vulnerability (CVE‑2025‑8671) is a Distributed Denial of Service (DDoS) attack that exploits a logical flaw in the HTTP/2 protocol implementations. This vulnerability leverages malformed HTTP/2 control frames to bypass the maximum concurrent streams limit, leading to resource exhaustion and Denial of Service.

Security researcher Gal Bar Nahum reported that the vulnerability could impact multiple implementations of the HTTP/2 protocol. While the protocol considers resetting HTTP streams as closing them. In practice, these requests continue to be processed by the server. This discrepancy creates a gap between the requests the protocol deems inactive and those that are genuinely active, allowing for the exploitation of server resources.

• https://galbarnahum.com/posts/made-you-reset-intro