Provide references for CVE-2021-27964.
Where can I find more information about CVE-2021-27964?
References are available at: https://github.com/erberkan/SonLogger-vulns, https://www.sonlogger.com/releasenotes, http://packetstormsecurity.com/files/161793/SonLogger-4.2.3.3-Shell-Upload.html.