Vulnerability Monitor

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CVE-2021-34473

Microsoft Exchange Server Remote Code Execution Vulnerability

Published

2021-07-14T18:15:11.163

Last Modified

2025-10-29T16:46:45.370

Status

Analyzed

Source

[email protected]

Severity

CVSSv3.1: 9.1 (CRITICAL)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:C/I:C/A:C

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: COMPLETE
Integrity Impact: COMPLETE
Availability Impact: COMPLETE

Exploitability Score

10.0

Impact Score

10.0

Weaknesses

Type: Primary
CWE-918
Type: Secondary
CWE-918

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	microsoft	exchange_server	2013	Yes
Application	microsoft	exchange_server	2016	Yes
Application	microsoft	exchange_server	2016	Yes
Application	microsoft	exchange_server	2019	Yes
Application	microsoft	exchange_server	2019	Yes

References

http://packetstormsecurity.com/files/163895/Microsoft-Exchange-ProxyShell-Remote-Code-Execution.html Exploit, Third Party Advisory, VDB Entry ([email protected])
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34473 Patch, Vendor Advisory ([email protected])
https://www.zerodayinitiative.com/advisories/ZDI-21-821/ Third Party Advisory, VDB Entry ([email protected])
http://packetstormsecurity.com/files/163895/Microsoft-Exchange-ProxyShell-Remote-Code-Execution.html Exploit, Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34473 Patch, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.zerodayinitiative.com/advisories/ZDI-21-821/ Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-34473 US Government Resource (134c704f-9b21-4f2e-91b3-4a467353bcc0)