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CVE-2021-26855NVD

Vulnerability Summary

Microsoft Exchange Server Remote Code Execution Vulnerability

Severity Level

CRITICAL(9.1)

Published Date

Mar 3, 2021

Last Modified

Aug 19, 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

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

External References

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