CVE-2020-17144

HIGH8.4

CISA KEV

Published 2020-12-10 · Updated 2026-06-17 · Source secure@microsoft.com

Summary

CVE-2020-17144 is a high-severity (CVSS 8.4) vulnerability in Microsoft Exchange Server. CISA added it to the Known Exploited Vulnerabilities catalog on November 3, 2021, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by May 3, 2022. CISA does not currently list it as used in ransomware campaigns. Microsoft has 390 vulnerabilities in the KEV catalog, 117 of them linked to ransomware.

All 390 known-exploited Microsoft vulnerabilities →

Description

Microsoft Exchange Remote Code Execution Vulnerability

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

CWE-502CWE-502

CISA Known-Exploited Vulnerability

Product: Microsoft — Exchange Server

Name: Microsoft Exchange Server Remote Code Execution Vulnerability

Date added: 2021-11-03 · Due: 2022-05-03

Required action: Apply updates per vendor instructions.

References

View on NVD

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