CVE-2021-27065
Microsoft Exchange Server Remote Code Execution Vulnerability
- Published
- Mar 2, 2021
- Updated
- Aug 19, 2026
- Assigning CNA
- microsoft
- Evidence observed
- Mar 11, 2021
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HHigh · next 30 days
- Percentile
- 100.0%
- Model date
- Sep 21, 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 Remote Code Execution Vulnerability
Sources
17- ExchangeSSRFtoRCEExploitExploit
Exploit chain for CVE-2021-26855 (SSRF) and CVE-2021-27065 (RCE) targeting Microsoft Exchange servers, enabling remote code execution via ProxyLogon vulnerability.
- 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.
- ProxyLogonExploit
Exploit chain for CVE-2021-26855 and CVE-2021-27065 targeting Microsoft Exchange Server, enabling authentication bypass and remote code execution via SSRF and arbitrary-file-write.
Responsible use
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