Provide references for CVE-2021-31207.
Where can I find more information about CVE-2021-31207?
References are available at: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31207, https://www.zerodayinitiative.com/advisories/ZDI-21-819/, http://packetstormsecurity.com/files/163895/Microsoft-Exchange-ProxyShell-Remote-Code-Execution.html.