Microsoft Defender AV must be configured for protocol recognition for network protection.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-213436	SRG-APP-000278	WNDF-AV-000012	SV-213436r823044_rule	2022-04-08	2

Description
This policy setting allows the configuration of protocol recognition for network protection against exploits of known vulnerabilities. If this setting is enabled or not configured, protocol recognition will be enabled. If this setting is disabled, protocol recognition will be disabled.

ℹ️ Check
Verify the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Microsoft Defender Antivirus >> Network Inspection System >> "Turn on protocol recognition" is set to "Enabled" or "Not Configured". Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Policies\Microsoft\Windows Defender\NIS Criteria: If the value "DisableProtocolRecognition" is REG_DWORD = 0, this is not a finding. If the value does not exist, this is not a finding. If the value is 1, this is a finding.

ℹ️ Check

Verify the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Microsoft Defender Antivirus >> Network Inspection System >> "Turn on protocol recognition" is set to "Enabled" or "Not Configured". Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Policies\Microsoft\Windows Defender\NIS Criteria: If the value "DisableProtocolRecognition" is REG_DWORD = 0, this is not a finding. If the value does not exist, this is not a finding. If the value is 1, this is a finding.

✔️ Fix
Set the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Microsoft Defender Antivirus >> Network Inspection System >> "Turn on protocol recognition" to "Enabled" or "Not Configured".