Critical9.1Microsoft Server

Critical [CVE-2021-27078] Microsoft Exchange Server Remote Code Execution Vulnerability

This critical-severity Microsoft Server advisory covers CVE-2021-27078 affecting Microsoft Exchange Server 2013 Cumulative Update 23, Microsoft Exchange Server 2016 Cumulative Update 18, Microsoft Exchange Server 2016 Cumulative Update 19.

CVE-2021-27078 Published Mar 2, 2021Updated by vendor Aug 19, 2026

CVE-2021-27078

Affected products & platforms

Microsoft ServerExchange Server

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Summary

Microsoft Exchange Server Remote Code Execution Vulnerability

Affected products named by the advisory: Microsoft Exchange Server 2013 Cumulative Update 23; Microsoft Exchange Server 2016 Cumulative Update 18; Microsoft Exchange Server 2016 Cumulative Update 19; Microsoft Exchange Server 2019 Cumulative Update 7; and 1 more.

Affected products named by the advisory: Microsoft Exchange Server 2019 Cumulative Update 8.

Affected versions

Microsoft Exchange Server 2013 Cumulative Update 23 15.00.0 before 15.00.1497.012
Microsoft Exchange Server 2016 Cumulative Update 18 15.01.0 before 15.01.2106.013
Microsoft Exchange Server 2016 Cumulative Update 19 15.01.0 before 15.01.2176.009
Microsoft Exchange Server 2019 Cumulative Update 7 15.02.0 before 15.02.0721.013
Microsoft Exchange Server 2019 Cumulative Update 8 15.02.0 before 15.02.0792.010

Official advisory · high-confidence parse· fetched 2 hours ago·verify at source

Fixed versions

15.00.1497.012
15.01.2106.013
15.01.2176.009
15.02.0721.013
15.02.0792.010

Official advisory · high-confidence parse· fetched 2 hours ago·verify at source

Mitigation

Upgrade to a fixed release: 15.00.1497.012, 15.01.2106.013, 15.01.2176.009, 15.02.0721.013, 15.02.0792.010. That is the remediation for this advisory.

The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.

Official advisory · high-confidence parse· fetched 2 hours ago·verify at source

Discussion(0)

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