Nov 28, 2019 – Autodesk released the AutoCAD Civil 3D 2018.3.1 Security Fix
The AutoCAD Civil 3D 2018.3.1 Security Fix is available via the Autodesk Desktop App or via download from the Autodesk subscription site.
The update requires access to the original install resources.
Autodesk Licensing Service 18.104.22.16899 Update
Autodesk AutoCAD Civil 3D 2018.3.1 fixes security vulnerabilities in code modules as described in CVE-2016-9842.
Specifically, this security fix updates the zlib library from versions 1.2.5 and 1.2.8 to version 1.2.11.
This security fix is provided because it would improve the security posture of the inflateMark function in zlib 1.2.8.