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AUSCERT Security Bulletin
ASB-2021.0062
Microsoft Patch Tuesday update for Exchange Server for April 2021
14 April 2021
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AusCERT Security Bulletin Summary
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Product: Microsoft Exchange Server Products
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-28483 CVE-2021-28482 CVE-2021-28481
CVE-2021-28480
OVERVIEW
Microsoft has released its monthly security patch update for the
month of April 2021.
This update resolves 4 vulnerabilities across the following products:
[1]
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
IMPACT
Microsoft has given the following details regarding these vulnerabilities.
Details Impact Severity
CVE-2021-28480 Remote Code Execution Critical
CVE-2021-28481 Remote Code Execution Critical
CVE-2021-28482 Remote Code Execution Critical
CVE-2021-28483 Remote Code Execution Critical
MITIGATION
Microsoft recommends updating the software with the version made
available on the Microsoft Update Catalogue for the following
Knowledge Base article. [1].
KB5001779
REFERENCES
[1] Microsoft Security Update Guidance
https://portal.msrc.microsoft.com/en-us/security-guidance
AusCERT has made every effort to ensure that the information contained
in this document is accurate. However, the decision to use the information
described is the responsibility of each user or organisation. The decision to
follow or act on information or advice contained in this security bulletin is
the responsibility of each user or organisation, and should be considered in
accordance with your organisation's site policies and procedures. AusCERT
takes no responsibility for consequences which may arise from following or
acting on information or advice contained in this security bulletin.
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Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
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