Log4net.dll is listed as a Security Vulnerability This DLL is installed by Revit and seen as a vulnerability by Fortinet Anti-Virus Software.
This is caused by an older version of Apache Software being installed.
This issue is resolved in
Revit 2022 Update 1.1
Revit 2021 Update 1.5
Revit 2020 Update 2.6
Revit 2019 Update 2.4
Other updates are planned.
The Incident number for this issue is ID181671
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