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CVE-2021-42321

HIGHCISA KEV

8.8

Description

Microsoft Exchange Server Remote Code Execution Vulnerability

CVE Details

CVSS v3.1 Score8.8

SeverityHIGH

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredLOW

User InteractionNONE

Published11/10/2021

Last Modified10/30/2025

Sourcekev

Honeypot Sightings0

CISA KEV

VendorMicrosoft

ProductExchange

Vulnerability NameMicrosoft Exchange Server Remote Code Execution Vulnerability

KEV Date Added2021-11-17

Remediation Due Date2021-12-01

Ransomware UseKnown

Affected Products

microsoft:exchange_server

References

http://packetstormsecurity.com/files/166153/Microsoft-Exchange-Server-Remote-Code-Execution.html(secure@microsoft.com)

http://packetstormsecurity.com/files/168131/Microsoft-Exchange-Server-ChainedSerializationBinder-Remote-Code-Execution.html(secure@microsoft.com)

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42321(secure@microsoft.com)

http://packetstormsecurity.com/files/166153/Microsoft-Exchange-Server-Remote-Code-Execution.html(af854a3a-2127-422b-91ae-364da2661108)

http://packetstormsecurity.com/files/168131/Microsoft-Exchange-Server-ChainedSerializationBinder-Remote-Code-Execution.html(af854a3a-2127-422b-91ae-364da2661108)

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42321(af854a3a-2127-422b-91ae-364da2661108)

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-42321(134c704f-9b21-4f2e-91b3-4a467353bcc0)

IOC Correlations

No correlations recorded

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