CVE-2021-31196

Microsoft Exchange Server 2013 Cumulative Update 23, Microsoft Exchange Server 2016 Cumulative Update 20, Microsoft Exchange Server 2016 Cumulative Update 21

Published 14 Jul 2021 · updated 10 Aug 2026 · Analyzed

7.2 High · CVSS 3.1, microsoft.com

Exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on 21 Aug 2024, with a remediation deadline of 11 Sept 2024 for US federal agencies.

Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Description

Microsoft Exchange Server Remote Code Execution Vulnerability

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2021-31196 · Patch, Vendor Advisory
portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31196 · Patch, Vendor Advisory
www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-31196 · US Government Resource