🛡 CVE-2021-27065
Microsoft Exchange Server Remote Code Execution Vulnerability
Microsoft Exchange Server CWE-39
Ransomware use
KNOWN
CISA KEV
EPSS
99.9%
Likely exploited · 100th pct
Added to KEV
2021-11-03
CISA
Remediate by
2022-05-03
⚠ OVERDUE
CWE
CWE-39
weakness
📈 EPSS exploit probability
99.9%
FIRST EPSS — 30-day probability of exploitation in the wild · band Likely exploited · higher than 100% of all scored CVEs
⚠ KEV remediation overdue
CISA required federal remediation by 2022-05-03. This exploited vulnerability is past its Binding Operational Directive 22-01 due date — prioritize patch/mitigation and hunt for exploitation.
📄 Description
Microsoft Exchange Server contains an unspecified vulnerability that allows for remote code execution. This vulnerability is part of the ProxyLogon exploit chain.
🏹 Attributed exploitation
Malware / ransomware (KEV): DearCry (ProxyLogon)
Threat actors (KEV): HAFNIUM (CN)
🔗 External references & OSINT
🔄 Internal pivots & actions
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