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CVE-2021-34473

CRITICALCISA KEV

9.1

Description

Microsoft Exchange Server Remote Code Execution Vulnerability

CVE Details

CVSS v3.1 Score9.1

SeverityCRITICAL

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

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published7/14/2021

Last Modified10/29/2025

Sourcekev

Honeypot Sightings0

CISA KEV

VendorMicrosoft

ProductExchange Server

Vulnerability NameMicrosoft Exchange Server Remote Code Execution Vulnerability

KEV Date Added2021-11-03

Remediation Due Date2021-11-17

Ransomware UseKnown

Affected Products

microsoft:exchange_server

Weaknesses (CWE)

CWE-918CWE-918

References

http://packetstormsecurity.com/files/163895/Microsoft-Exchange-ProxyShell-Remote-Code-Execution.html(secure@microsoft.com)

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34473(secure@microsoft.com)

https://www.zerodayinitiative.com/advisories/ZDI-21-821/(secure@microsoft.com)

http://packetstormsecurity.com/files/163895/Microsoft-Exchange-ProxyShell-Remote-Code-Execution.html(af854a3a-2127-422b-91ae-364da2661108)

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34473(af854a3a-2127-422b-91ae-364da2661108)

https://www.zerodayinitiative.com/advisories/ZDI-21-821/(af854a3a-2127-422b-91ae-364da2661108)

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-34473(134c704f-9b21-4f2e-91b3-4a467353bcc0)

IOC Correlations

No correlations recorded

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