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September 23, 2026

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CVE-2021-34473NVD

Vulnerability Summary

Microsoft Exchange Server Remote Code Execution Vulnerability
Severity Level
CRITICAL(9.1)
Published Date
Jul 14, 2021
Last Modified
Aug 10, 2026
Exploitation Status
ACTIVE
EPSS Score (30-Day)
100.00%Probability
Root Weakness (CWE)
CWE-918: Unknown/Unlisted Weakness ↗
Refer to the official MITRE database for detailed architectural specifications regarding this weakness.
CVSS v3.1 Base Metrics — Score 9.1 (CRITICAL)
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone

Affected & Patched Versions

Affected Versions
  • Microsoft Exchange Server
Patched Versions
Not provided by NVD for this CVE.
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📧Email Delivery — Threat intel straight to your inbox.
♾️Unlimited Vendors — Track your entire stack.
🚨All New CVEs — Be the first to know.
⚙️Custom EPSS — Filter noise, focus on risk.
💬Webhooks — Slack & Teams integration.
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External References