CVE-2021-27065
Act now ● On CISA KEV — actively exploited used in ransomware
Actively exploited — on the CISA KEV list.
CVSS base
7.8
HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS — probability of exploitation (30 days)
99.9%
100.0th percentile
CISA KEV
Listed
Added 2021-11-03 · patch by 2022-05-03
Weakness / dates
CWE-22
Published 2021-03-03 · modified 2026-08-19
Description
Microsoft Exchange Server Remote Code Execution Vulnerability
Affected
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-27065
- exploit http://packetstormsecurity.com/files/161938/Microsoft-Exchange-ProxyLogon-Remote-Code-Execution.html
- exploit http://packetstormsecurity.com/files/162736/Microsoft-Exchange-ProxyLogon-Collector.html
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-27065
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-27065