Remote Desktop error: CredSSP encryption oracle remediation

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Mattias Geniar, May 14, 2018

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A while back, Microsoft announced it would ship updates to both its RDP client & server components to resolve a critical security vulnerability. That rollout is now happening and many clients have received auto-updates for their client.

As a result, you might see this message/error when connecting to an unpatched Windows server:

It refers toΒ CredSSP updates for CVE-2018-0886, which further explains the vulnerability and why it’s been patched now.

But here’s the catch: if your client is updated but your server isn’t (yet), you can no longer RDP to that machine. Here’s a couple of fixes;

  1. Find an old computer/RDP client to connect with
  2. Get console access to the server to run the updates & reboot the machine

If your client has been updated, there’s no way to connect to an unpatched Windows server via Remote Desktop anymore.

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