CVE-2021-34523
Microsoft Exchange Server Elevation of Privilege Vulnerability
- Published
- Jul 14, 2021
- Updated
- Aug 10, 2026
- Assigning CNA
- microsoft
- Evidence observed
- Nov 3, 2021
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HHigh · next 30 days
- Percentile
- 100.0%
- Model date
- Oct 18, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
CISA Known Exploited
This CVE appears in the CISA Known Exploited Vulnerabilities catalog.
Summary
Microsoft Exchange Server Elevation of Privilege Vulnerability
Sources
modules/exploits/windows/http/exchange_proxyshell_rce.rb
Metasploit Framework modulesDeclared conditions
- platform: Windows($.exploit_windows/http/exchange_proxyshell_rce.platform)
- verification: check_declared($.exploit_windows/http/exchange_proxyshell_rce.check)
- proxyshellExploit
Proof of Concept for CVE-2021-34473, CVE-2021-34523, and CVE-2021-31207
- ProxyVulnsExploit
[ProxyLogon] CVE-2021-26855 & CVE-2021-27065 Fixed RawIdentity Bug Exploit. [ProxyOracle] CVE-2021-31195 & CVE-2021-31196 Exploit Chains. [ProxyShell] CVE-2021-34473 & CVE-2021-34523 & CVE-2021-31207 Exploit Chains.
Responsible use
Use vulnerability information only on systems you own or are authorized to test. Kitploit links to public research metadata and does not store exploit code or malicious payloads.