Provide references for CVE-2021-33500.
Where can I find more information about CVE-2021-33500?
References are available at: https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html, https://docs.ssh-mitm.at/puttydos.html, https://github.com/ssh-mitm/ssh-mitm-plugins/blob/main/ssh_mitm_plugins/ssh/putty_dos.py.