Microsoft Improperly Issued Digital Certificates Spoofing Vulnerability (KB3123040)

Normally this issue should be fix using update, so make sure update your Windows Server and install all updates.
You may have a look at:
https://support.microsoft.com/en-us/topic/microsoft-security-advisory-improperly-issued-digital-certificates-could-allow-spoofing-e6afed12-741d-d4a9-f9d8-d4712aebf5ff

And

https://docs.microsoft.com/en-us/security-updates/SecurityAdvisories/2015/3123040

In case you update the system and perform fix and issue persist, try restart the server and if problem continues, you might need to update the Qualys or contact their support.