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Unrated severityCISA KEVNVD Advisory· Published Nov 10, 2021· Updated Oct 21, 2025

Microsoft Exchange Server Remote Code Execution Vulnerability

CVE-2021-42321

Description

Microsoft Exchange Server Remote Code Execution Vulnerability

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

5

Microsoft/Exchange Serverv55 versions
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_21:*:*:*:*:*:*+ 4 more
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_21:*:*:*:*:*:*range: 15.01.0
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_22:*:*:*:*:*:*range: 15.0.0
- cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_10:*:*:*:*:*:*range: 15.02.0
- cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_11:*:*:*:*:*:*range: 15.02.0
- (no CPE)

Patches

Vulnerability mechanics

References

3

packetstormsecurity.com/files/166153/Microsoft-Exchange-Server-Remote-Code-Execution.htmlmitrex_refsource_MISC
packetstormsecurity.com/files/168131/Microsoft-Exchange-Server-ChainedSerializationBinder-Remote-Code-Execution.htmlmitrex_refsource_MISC
portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42321mitrex_refsource_MISC

News mentions

0

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