CVE-2021-27065: Microsoft Exchange Server Remote Code Execution Vulnerability
Published Mar 2, 2021
·Updated
Microsoft Exchange Server contains an unspecified vulnerability that allows for remote code execution. This vulnerability is part of the ProxyLogon exploit chain.
Other sources
Microsoft Exchange Server Remote Code Execution Vulnerability
— NVD
Affected Software
51 affected componentsFixes available
Microsoft Exchange Server
Microsoft Exchange Server=2013-cumulative_update_22
Microsoft Exchange Server=2013-cumulative_update_23
Microsoft Exchange Server=2013-sp1
Microsoft Exchange Server=2016-cumulative_update_10
Microsoft Exchange Server=2016-cumulative_update_11
Microsoft Exchange Server=2016-cumulative_update_12
Microsoft Exchange Server=2016-cumulative_update_13
Microsoft Exchange Server=2016-cumulative_update_14
Microsoft Exchange Server=2016-cumulative_update_15
Microsoft Exchange Server=2016-cumulative_update_16
Microsoft Exchange Server=2016-cumulative_update_17
Microsoft Exchange Server=2016-cumulative_update_18
Microsoft Exchange Server=2016-cumulative_update_19
Microsoft Exchange Server=2016-cumulative_update_8
Microsoft Exchange Server=2016-cumulative_update_9
Microsoft Exchange Server=2019
Microsoft Exchange Server=2019-cumulative_update_1
Microsoft Exchange Server=2019-cumulative_update_2
Microsoft Exchange Server=2019-cumulative_update_4
Microsoft Exchange Server=2019-cumulative_update_5
Microsoft Exchange Server=2019-cumulative_update_6
Microsoft Exchange Server=2019-cumulative_update_7
Microsoft Exchange Server=2019-cumulative_update_8
Microsoft Exchange Server=2013-cumulative_update_21
Microsoft Exchange Server=2019-cumulative_update_3
Microsoft Exchange Server 2013<15.00.0847.064
15.00.0847.064
Microsoft Exchange Server 2016=12
15.01.1713.010
Microsoft Exchange Server 2016=16
15.01.1979.008
Microsoft Exchange Server 2016=19
15.01.2176.009
Microsoft Exchange Server 2013=21
15.00.1395.012
Microsoft Exchange Server 2016=17
15.01.2044.013
Microsoft Exchange Server 2019=6
15.02.0529.013
Microsoft Exchange Server 2016=18
15.01.2106.013
Microsoft Exchange Server 2019=8
15.02.0792.010
Microsoft Exchange Server 2019=7
15.02.0721.013
Microsoft Exchange Server 2016=15
15.01.1913.012
Microsoft Exchange Server 2019=3
15.02.0464.015
Microsoft Exchange Server 2019=5
15.02.0595.008
Microsoft Exchange Server 2016=14
15.01.1847.012
Microsoft Exchange Server 2016=13
15.01.1779.008
Microsoft Exchange Server 2019=4
15.02.0659.012
Microsoft Exchange Server 2013=23
15.00.1497.012
Microsoft Exchange Server 2016=11
15.01.1591.018
Microsoft Exchange Server 2019=2
15.02.0397.011
Microsoft Exchange Server 2016=10
15.01.1531.012
Microsoft Exchange Server 2016=9
15.01.1466.016
Microsoft Exchange Server 2013=22
15.00.1473.006
Microsoft Exchange Server 2019=1
15.01.1979.006
Microsoft Exchange Server 2016=8
15.01.1415.010
Microsoft Exchange Server 2019<15.02.0221.018
15.02.0221.018
Remediation
Event History
Mar 2, 2021
CVE Published
via Microsoft·04:00 PM
Known Exploited
via Microsoft·04:00 PM
Data Sourced
via Microsoft·04:00 PM
DescriptionSeverityWeaknessAffected Software
Updated
via Microsoft·04:00 PM
Affected Software
Updated
via Microsoft·04:00 PM
Description
CVE Published
via MITRE·11:55 PM
Data Sourced
via MITRE·11:55 PM
DescriptionSeverity
Mar 3, 2021
Data Sourced
via NVD·12:15 AM
RemedyDescriptionSeverityWeaknessAffected Software
Nov 3, 2021
Known Ransomware
via CISA·12:00 AM
Dec 2, 2023
News Published
06:54 PM
Oct 7, 2024
News Published
via BleepingComputer·02:51 PM
News Published
via BleepingComputer·02:52 PM
Nov 27, 2024
News Published
via The Register·11:44 PM
News Published
via The Register·11:48 PM
May 2, 2025
News Published
via BleepingComputer·02:32 PM
Apr 30, 2026
News Published
via The Register·11:00 AM
Peer vulnerabilities
Found alongside the following vulnerabilities.
Frequently Asked Questions
1
What is CVE-2021-27065?
CVE-2021-27065 is a remote code execution vulnerability in Microsoft Exchange Server.
2
How does CVE-2021-27065 impact Microsoft Exchange Server?
CVE-2021-27065 allows an attacker to remotely execute code on a vulnerable Microsoft Exchange Server.
3
What is the severity of CVE-2021-27065?
CVE-2021-27065 has a severity rating of 7.8 (high).
4
Which versions of Microsoft Exchange Server are affected by CVE-2021-27065?
CVE-2021-27065 affects Microsoft Exchange Server 2013, 2016, and 2019.
5
How can I mitigate CVE-2021-27065?
To mitigate CVE-2021-27065, apply the security updates provided by Microsoft and follow the recommended mitigation measures.