CVE-2021-34473: Microsoft Exchange Server Remote Code Execution Vulnerability
Published Jul 13, 2021
·Updated
Microsoft Exchange Server contains an unspecified vulnerability that allows for remote code execution.
Other sources
Microsoft Exchange Server Remote Code Execution Vulnerability
— Microsoft
Affected Software
12 affected componentsFixes available
Microsoft Exchange Server
Microsoft Exchange Server=2013-cumulative_update_23
Microsoft Exchange Server=2016-cumulative_update_19
Microsoft Exchange Server=2016-cumulative_update_20
Microsoft Exchange Server=2019-cumulative_update_8
Microsoft Exchange Server=2019-cumulative_update_9
Microsoft Exchange
Microsoft Exchange Server 2016=19
15.01.2176.012
Microsoft Exchange Server 2013=23
15.00.1497.015
Microsoft Exchange Server 2016=20
15.01.2242.008
Microsoft Exchange Server 2019=9
15.02.0858.010
Microsoft Exchange Server 2019=8
15.02.0792.013
Remediation
Event History
Jul 13, 2021
CVE Published
via Microsoft·02:00 PM
Data Sourced
via Microsoft·02:00 PM
DescriptionSeverityWeaknessAffected Software
Updated
via Microsoft·02:00 PM
Affected Software
Updated
via Microsoft·02:00 PM
Description
Jul 14, 2021
CVE Published
via MITRE·05:54 PM
Data Sourced
via MITRE·05:54 PM
DescriptionSeverity
Data Sourced
via NVD·06:15 PM
RemedyDescriptionSeverityWeaknessAffected Software
Jul 19, 2021
Advisory Published
via ZDI·12:00 AM
Data Sourced
via ZDI·12:00 AM
DescriptionSeverityAffected Software
Nov 3, 2021
Known Exploited
via CISA·12:00 AM
Known Ransomware
via CISA·12:00 AM
Jul 9, 2024
News Published
via The Register·02:33 AM
News Published
via The Register·02:36 AM
Jul 30, 2024
News Published
via BleepingComputer·12:00 PM
News Published
via BleepingComputer·12:01 PM
Feb 12, 2025
News Published
via Dark Reading·05:00 PM
News Published
via Dark Reading·05:00 PM
Feb 19, 2025
News Published
via BleepingComputer·08:55 PM
May 21, 2025
News Published
via BleepingComputer·02:02 PM
Frequently Asked Questions
1
What is CVE-2021-34473?
CVE-2021-34473 is a vulnerability that allows remote attackers to execute arbitrary code on affected installations of Microsoft Exchange Server.
2
What is the severity of CVE-2021-34473?
CVE-2021-34473 has a severity rating of critical.
3
How does CVE-2021-34473 affect Microsoft Exchange Server?
CVE-2021-34473 affects Microsoft Exchange Server by allowing remote attackers to execute arbitrary code.
4
Is authentication required to exploit CVE-2021-34473?
No, authentication is not required to exploit CVE-2021-34473.
5
How can I fix CVE-2021-34473?
To fix CVE-2021-34473, apply the security patch provided by Microsoft and follow the recommended mitigation steps.