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CVE-2021-28480

CriticalPublished

Microsoft Exchange Server Remote Code Execution Vulnerability

Published: Apr 13, 2021
Updated: Aug 3, 2024
Assigning CNA: microsoft
Evidence observed: Aug 25, 2026

Primary CVSS

9.8/ 10Critical

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

71.2%

High · next 30 days

Percentile: 99.4%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Microsoft Exchange Server Remote Code Execution Vulnerability

Sources

CVE-2021-28480PoC
Proof-of-concept exploit for CVE-2021-28480, a Microsoft Exchange Server vulnerability, demonstrating remote code execution.

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