CVE-2021-31209

MediumCVSS 6.5/10Last modified Jun 17, 2026

Description

Microsoft Exchange Server Spoofing Vulnerability

Metrics

CVSS 3.1 6.5/10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N

Weakness enumeration

CWE-290

Affected software

Vendor	Product	Versions
Microsoft	Microsoft Exchange Server 2019 Cumulative Update 9	>= 15.02.0, < 15.02.0858.012
Microsoft	Microsoft Exchange Server 2016 Cumulative Update 20	>= 15.01.0, < 15.01.2242.010
Microsoft	Microsoft Exchange Server 2013 Cumulative Update 23	>= 15.00.0, < 15.00.1497.018
Microsoft	Microsoft Exchange Server 2016 Cumulative Update 19	>= 15.01.0, < 15.01.2176.014
Microsoft	Microsoft Exchange Server 2019 Cumulative Update 8	>= 15.02.0, < 15.02.0792.015

References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31209Patch, Vendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-615/Third Party Advisory, VDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31209Patch, Vendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-615/Third Party Advisory, VDB Entry

Timeline

Published: May 11, 2021
Last modified: Jun 17, 2026
NVD status: Modified

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