Vulnerability Details : CVE-2021-31207
Public exploit exists!
Used for ransomware!
Microsoft Exchange Server Security Feature Bypass Vulnerability
Products affected by CVE-2021-31207
- cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_23:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_19:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_8:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_20:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_9:*:*:*:*:*:*
CVE-2021-31207 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 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.
Notes:
https://nvd.nist.gov/vuln/detail/CVE-2021-31207
Added on
2021-11-03
Action due date
2021-11-17
Exploit prediction scoring system (EPSS) score for CVE-2021-31207
96.18%
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-2021-31207
-
Microsoft Exchange ProxyShell RCE
Disclosure Date: 2021-04-06First seen: 2022-12-23exploit/windows/http/exchange_proxyshell_rceThis 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 Cod
CVSS scores for CVE-2021-31207
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
6.5
|
MEDIUM | AV:N/AC:L/Au:S/C:P/I:P/A:P |
8.0
|
6.4
|
NIST | |
|
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
|
NIST | 2024-07-26 |
|
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
|
NIST | |
|
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
|
Microsoft Corporation |
CWE ids for CVE-2021-31207
-
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)
-
The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-31207
-
http://packetstormsecurity.com/files/163895/Microsoft-Exchange-ProxyShell-Remote-Code-Execution.html
Microsoft Exchange ProxyShell Remote Code Execution ≈ Packet StormExploit;Third Party Advisory;VDB Entry
-
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31207
CVE-2021-31207 - Security Update Guide - Microsoft - Microsoft Exchange Server Security Feature Bypass VulnerabilityPatch;Vendor Advisory
-
https://www.zerodayinitiative.com/advisories/ZDI-21-819/
ZDI-21-819 | Zero Day InitiativeThird Party Advisory;VDB Entry
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