Vulnerability Details : CVE-2021-31207

Microsoft Exchange Server Security Feature Bypass Vulnerability
Vulnerability category: Directory traversal
Published 2021-05-11 19:15:10
Updated 2023-08-02 00:15:15
View at NVD,   CVE.org
At least one public exploit which can be used to exploit this vulnerability exists!
CVE-2021-31207 is in the CISA Known Exploited Vulnerabilities Catalog
CISA vulnerability name:
Microsoft Exchange Server Security Feature Bypass Vulnerability
CISA required action:
Apply updates per vendor instructions.
CISA description:
Microsoft Exchange Server contains an unspecified vulnerability that allows for security feature bypass.
Added on 2021-11-03 Action due date 2021-11-17

Exploit prediction scoring system (EPSS) score for CVE-2021-31207

Probability of exploitation activity in the next 30 days: 95.40%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 99 % EPSS Score History EPSS FAQ

Metasploit modules for CVE-2021-31207

  • Microsoft Exchange ProxyShell RCE
    Disclosure Date : 2021-04-06
    exploit/windows/http/exchange_proxyshell_rce
    This module exploits a vulnerability on Microsoft Exchange Server that allows an attacker to bypass the authentication (CVE-2021-31207), impersonate an arbitrary user (CVE-2021-34523) and write an arbitrary file (CVE-2021-34473) to achieve the RCE (Remote Code Execution). By taking advantage of this vulnerability, you can execute arbitrary commands on the remote Microsoft Exchange Server. This vulnerability affects Exchange 2013 CU23 < 15.0.1497.15, Exchange 2016 CU19 < 15.1.2176.12, Exchange 2016 CU20 < 15.1.2242.5, Exchange 2019 CU8 < 15.2.792.13, Exchange 2019 CU9 < 15.2.858.9. All components are vulnerable by default.

CVSS scores for CVE-2021-31207

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Source
6.5
MEDIUM AV:N/AC:L/Au:S/C:P/I:P/A:P
8.0
6.4
[email protected]
7.2
HIGH CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
1.2
5.9
[email protected]
6.6
MEDIUM CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
0.7
5.9
[email protected]

CWE ids for CVE-2021-31207

References for CVE-2021-31207

Products affected by CVE-2021-31207

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