CVE-2021-26855, CVE-2021-26858, CVE-2021-26857, CVE-2021-27065 (ProxyLogon)
2021 was not a great year for Exchange admins, as this group of four vulnerabilities created yet another crisis.
Known as ProxyLogon, these bugs combine four different code execution flaws in Exchange Server that could allow an unauthenticated malicious actor to execute arbitrary code on vulnerable Exchange Servers, enabling them to gain persistent access to files, mailboxes and credentials stored on the servers. Going a step further, hackers can potentially compromise trust and identity on the network.
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