CVE-2021-34523
Microsoft Exchange Server Privilege Escalation Vulnerability
Microsoft Exchange Server Elevation of Privilege Vulnerability.
CRITICAL · CVSS 9
⚠ CISA KEV
EPSS 0.93947
Ransomware: known
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- Listed on CISA KEV (known exploited in the wild)
- Linked to known ransomware campaigns
- SSVC exploitation status: active
- EPSS ≥ 0.50 - high probability of exploitation in the next 30 days
- EPSS percentile: top 0% of all CVEs by exploitation likelihood
- Public exploit or PoC is available
- CVSS base score ≥ 7.0
Sigma rules10
YARA rules0