References https://nvd.nist.gov/vuln/detail/CVE-2021-33766 https://www.cve.org/CVERecord?id=CVE-2021-33766 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-33766 https://www.zerodayinitiative.com/advisories/ZDI-21-798/ https://www.sentinelone.com/vulnerability-database/cve-2021-33766/ https://arcticwolf.com/resources/blog/proxytoken-authentication-bypass-vulnerability-in-on-premises-microsoft-exchange/ https://github.com/bhdresh/CVE-2021-33766 https://avd.aliyun.com/detail?id=AVD-2021-33766 https://www.thezdi.com/blog/2021/8/30/proxytoken-an-authentication-bypass-in-microsoft-exchange-server https://thehackernews.com/2021/08/new-microsoft-exchange-proxytoken-flaw.html https://support.microsoft.com/en-us/topic/description-of-the-security-update-for-microsoft-exchange-server-2019-2016-and-2013-april-13-2021-kb5001779-8e08f3b3-fc7b-466c-bbb7-5d5aa16ef064 https://cn-sec.com/archives/495669.html https://www.4hou.com/posts/E1Nl
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