Vulnerability Details : CVE-2021-27065

Public exploit exists!
Used for ransomware!
Microsoft Exchange Server Remote Code Execution Vulnerability
Published 2021-03-03 00:15:12
Updated 2024-07-25 17:34:22
Source Microsoft Corporation
View at NVD,   CVE.org
Vulnerability category: Execute code

Products affected by CVE-2021-27065

CVE-2021-27065 is in the CISA Known Exploited Vulnerabilities Catalog

This issue is known to have been leveraged as part of a ransomware campaign.
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.
Notes:
Reference CISA's ED 21-02 (https://www.cisa.gov/news-events/directives/ed-21-02-mitigate-microsoft-exchange-premises-product-vulnerabilities) for further guidance and requirements. Note: The due date for addressing this vulnerability aligns with the requirements outlined in ED 21-02. https://nvd.nis
Added on 2021-11-03 Action due date 2021-04-16

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

EPSS FAQ
95.78%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 100 %
Percentile, the proportion of vulnerabilities that are scored at or less

Metasploit modules for CVE-2021-27065

  • Microsoft Exchange ProxyLogon RCE
    Disclosure Date: 2021-03-02
    First seen: 2021-03-23
    exploit/windows/http/exchange_proxylogon_rce
    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 Score Source First Seen
6.8
 MEDIUM AV:N/AC:M/Au:N/C:P/I:P/A:P
8.6
6.4
 NIST
7.8
 HIGH CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
1.8
5.9
 NIST
7.8
 HIGH CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
1.8
5.9
 Microsoft Corporation

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: nvd@nist.gov (Primary)

References for CVE-2021-27065

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