Vulnerability Details : CVE-2021-27065

Microsoft Exchange Server Remote Code Execution Vulnerability This CVE ID is unique from CVE-2021-26412, CVE-2021-26854, CVE-2021-26855, CVE-2021-26857, CVE-2021-26858, CVE-2021-27078.
Vulnerability category: Directory traversalExecute code
Published 2021-03-03 00:15:12
Updated 2022-07-12 17:42:04
View at NVD,
At least one public exploit which can be used to exploit this vulnerability exists!
CVE-2021-27065 is in the CISA Known Exploited Vulnerabilities Catalog
CISA vulnerability name:
Microsoft Exchange Server Remote Code Execution Vulnerability
CISA required action:
Apply updates per vendor instructions.
CISA description:
Microsoft Exchange Server contains an unspecified vulnerability that allows for remote code execution. This vulnerability is part of the ProxyLogon exploit chain.
Reference CISA's ED 21-02 ( for further guidance and requirements.
Added on 2021-11-03 Action due date 2021-04-16

Exploit prediction scoring system (EPSS) score for CVE-2021-27065

Probability of exploitation activity in the next 30 days: 96.94%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 100 % EPSS Score History EPSS FAQ

Metasploit modules for CVE-2021-27065

  • Microsoft Exchange ProxyLogon RCE
    Disclosure Date: 2021-03-02
    First seen: 2021-03-23
    This module exploit a vulnerability on Microsoft Exchange Server that allows an attacker bypassing the authentication, impersonating as the admin (CVE-2021-26855) and write arbitrary file (CVE-2021-27065) to get the RCE (Remote Code Execution). By

CVSS scores for CVE-2021-27065

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Source

CWE ids for CVE-2021-27065

  • The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.
    Assigned by: (Primary)

References for CVE-2021-27065

Products affected by CVE-2021-27065

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