Vulnerability Details : CVE-2021-34473
Public exploit exists!
Used for ransomware!
Microsoft Exchange Server Remote Code Execution Vulnerability
Vulnerability category: Execute code
Products affected by CVE-2021-34473
- 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-2021-34473 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.
Notes:
https://nvd.nist.gov/vuln/detail/CVE-2021-34473
Added on
2021-11-03
Action due date
2021-11-17
Exploit prediction scoring system (EPSS) score for CVE-2021-34473
96.46%
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-2021-34473
-
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-2021-34473
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
10.0
|
HIGH | AV:N/AC:L/Au:N/C:C/I:C/A:C |
10.0
|
10.0
|
NIST | |
|
9.8
|
CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
3.9
|
5.9
|
NIST | |
|
9.1
|
CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
3.9
|
5.2
|
Microsoft Corporation |
CWE ids for CVE-2021-34473
-
The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-34473
-
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34473
CVE-2021-34473 - Security Update Guide - Microsoft - Microsoft Exchange Server Remote Code Execution VulnerabilityPatch;Vendor Advisory
-
https://www.zerodayinitiative.com/advisories/ZDI-21-821/
ZDI-21-821 | Zero Day InitiativeThird Party Advisory;VDB Entry
-
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
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