🛡 CVE-2021-34523
Microsoft Exchange Server Privilege Escalation Vulnerability
Microsoft Exchange Server CWE-287
Ransomware use
KNOWN
CISA KEV
EPSS
100.0%
Likely exploited · 100th pct
Added to KEV
2021-11-03
CISA
Remediate by
2021-11-17
⚠ OVERDUE
CWE
CWE-287
weakness
📈 EPSS exploit probability
100.0%
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 2021-11-17. 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 privilege escalation.
🏹 Attributed exploitation
Malware / ransomware (KEV): Conti, LockFile, BlackByte (ProxyShell)
Threat actors (KEV): multiple ransomware
Actor pivots: 🏹 multiple ransomware
🔗 External references & OSINT
🔄 Internal pivots & actions
🧩 Advanced Capabilities
Workstation · Copilot · AI Skills · Automation · Playbooks · Lookups · Docs · Reports
🤖 AI Copilot
⚡ AI Skills
🔍 Lookup & Enrich
📚 Docs & Reports
💡 Recommendations
- Explore related tools below
- Automate recurring work via cron