Provide references for CVE-2021-3199.
Where can I find more information about CVE-2021-3199?
References are available at: https://github.com/ONLYOFFICE/DocumentServer/blob/903fe5ab7a275bd69c3c3346af2d21cf87ebeabf/CHANGELOG.md#563, https://github.com/nola-milkin/poc_exploits/blob/master/CVE-2021-3199/poc_uploadImageFile.py, https://github.com/moehw/poc_exploits/tree/master/CVE-2021-3199/poc_uploadImageFile.py.