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High severity8.8CISA KEVNVD Advisory· Published Nov 10, 2021· Updated Jun 17, 2026

CVE-2021-42321

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 Server5 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:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_22:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_10:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_11:*:*:*:*:*:*
- (no CPE)

Patches

Vulnerability mechanics

References

4

portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42321nvdPatchVendor Advisory
packetstormsecurity.com/files/166153/Microsoft-Exchange-Server-Remote-Code-Execution.htmlnvdExploitThird Party AdvisoryVDB Entry
packetstormsecurity.com/files/168131/Microsoft-Exchange-Server-ChainedSerializationBinder-Remote-Code-Execution.htmlnvdExploitThird Party AdvisoryVDB Entry
www.cisa.gov/known-exploited-vulnerabilities-catalognvdUS Government Resource

News mentions

0

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