8.8
High
Exploited
· ransomware
CVE-2021-42321 Microsoft Exchange Server Remote Code Execution Vulnerability
Active exploitation observed
· CISA KEV catalogue
Required action
Apply updates per vendor instructions.
Ransomware campaigns
Known to be used
Weakness
CWE-502, CWE-184
Description
Microsoft Exchange Server Remote Code Execution Vulnerability
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Microsoft Exchange Server 2016 Cumulative Update 21 15.01 | 15.01.0 → < 15.01.2308.020 | 15.01.2308.020 |
| Microsoft Exchange Server 2019 Cumulative Update 10 15.02 | 15.02.0 → < 15.02.0792.019 | 15.02.0792.019 |
| Microsoft Exchange Server 2016 Cumulative Update 22 15.0 | 15.0.0 → < 15.01.2375.017 | 15.01.2375.017 |
| Microsoft Exchange Server 2019 Cumulative Update 11 15.02 | 15.02.0 → < 15.02.0986.014 | 15.02.0986.014 |
References
- Microsoft Exchange Server Remote Code Execution Vulnerability msrc.microsoft.com
Timeline
- Published
- Added to the KEV catalogue
- Last modified
Other CVEs of Microsoft Exchange Server 2016 Cumulative Update 21
The 16 CVEs of Microsoft Exchange Server 2016 Cumulative Update 21 →
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Microsoft Exchange Server Remote Code Execution Vulnerability
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CVE-2022-21855
Microsoft Exchange Server Remote Code Execution Vulnerability
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