Provide references for CVE-2020-21057.
Where can I find more information about CVE-2020-21057?
References are available at: https://resp3ctblog.wordpress.com/2019/10/28/fusionpbx-path-traversal-4/, https://github.com/fusionpbx/fusionpbx/commit/026c3958c3c7ca6b2ff067addc991aac8f41cf11.