CVE-2021-42321
Microsoft Exchange Server Remote Code Execution Vu - [Actively Exploited]
Description
Microsoft Exchange Server Remote Code Execution Vulnerability
INFO
Published Date :
Nov. 10, 2021, 1:19 a.m.
Last Modified :
March 7, 2025, 9:54 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
5.9
Exploitability Score :
2.8
CISA KEV (Known Exploited Vulnerabilities)
For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.
An authenticated attacker could leverage improper validation in cmdlet arguments within Microsoft Exchange and perform remote code execution.
Apply updates per vendor instructions.
https://nvd.nist.gov/vuln/detail/CVE-2021-42321
Public PoC/Exploit Available at Github
CVE-2021-42321 has a 45 public PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-42321.
| URL | Resource |
|---|---|
| http://packetstormsecurity.com/files/166153/Microsoft-Exchange-Server-Remote-Code-Execution.html | Exploit Third Party Advisory VDB Entry |
| http://packetstormsecurity.com/files/168131/Microsoft-Exchange-Server-ChainedSerializationBinder-Remote-Code-Execution.html | Exploit Third Party Advisory VDB Entry |
| https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42321 | Patch Vendor Advisory |
| http://packetstormsecurity.com/files/166153/Microsoft-Exchange-Server-Remote-Code-Execution.html | Exploit Third Party Advisory VDB Entry |
| http://packetstormsecurity.com/files/168131/Microsoft-Exchange-Server-ChainedSerializationBinder-Remote-Code-Execution.html | Exploit Third Party Advisory VDB Entry |
| https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42321 | Patch Vendor Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
exchange工具
Python C# PowerShell HTML
oscp notes
None
C#
This repository is designed to provide a comprehensive collection of study materials, notes, and resources for the Offensive Security Certified Professional (OSCP) exam. It covers all key topics from basic to advanced, helping aspiring penetration testers to prepare efficiently for the exam.
cybersecurity hacking oscp oscp-guide oscp-journey oscp-prep
None
Python C Shell PHP PowerShell ASP.NET
None
C#
OSCP and stuffs
Resources to learn about Insecure Deserialization
None
Python C Shell
All CVE - PoC in GitHub
poc proofofconcept tester allcve cvegithub cvenew cvepoc cveupdate
None
OffSec Certified Professional Certification (OSCP).
oscp oscp-cheatsheet oscp-guide oscp-journey oscp-prep oscp-tools offsec-certified-professional-certification offensive-security offensivesecurity awesome-list awesome-lists cheatsheet offensive-ops
Oscp-notes
None
None
C#
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-42321 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-42321 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Modified Analysis by [email protected]
Mar. 07, 2025
Action Type Old Value New Value -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference http://packetstormsecurity.com/files/166153/Microsoft-Exchange-Server-Remote-Code-Execution.html Added Reference http://packetstormsecurity.com/files/168131/Microsoft-Exchange-Server-ChainedSerializationBinder-Remote-Code-Execution.html Added Reference https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42321 -
Modified Analysis by [email protected]
Jul. 24, 2024
Action Type Old Value New Value -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CVE Modified by [email protected]
Dec. 28, 2023
Action Type Old Value New Value Added CVSS V3.1 Microsoft Corporation AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H -
Modified Analysis by [email protected]
Aug. 29, 2022
Action Type Old Value New Value Changed Reference Type http://packetstormsecurity.com/files/168131/Microsoft-Exchange-Server-ChainedSerializationBinder-Remote-Code-Execution.html No Types Assigned http://packetstormsecurity.com/files/168131/Microsoft-Exchange-Server-ChainedSerializationBinder-Remote-Code-Execution.html Exploit, Third Party Advisory, VDB Entry -
CVE Modified by [email protected]
Aug. 22, 2022
Action Type Old Value New Value Added Reference http://packetstormsecurity.com/files/168131/Microsoft-Exchange-Server-ChainedSerializationBinder-Remote-Code-Execution.html [No Types Assigned] -
CWE Remap by [email protected]
Jul. 12, 2022
Action Type Old Value New Value Changed CWE NVD-CWE-noinfo NVD-CWE-Other -
Modified Analysis by [email protected]
Mar. 29, 2022
Action Type Old Value New Value Changed Reference Type http://packetstormsecurity.com/files/166153/Microsoft-Exchange-Server-Remote-Code-Execution.html No Types Assigned http://packetstormsecurity.com/files/166153/Microsoft-Exchange-Server-Remote-Code-Execution.html Exploit, Third Party Advisory, VDB Entry -
CVE Modified by [email protected]
Feb. 25, 2022
Action Type Old Value New Value Added Reference http://packetstormsecurity.com/files/166153/Microsoft-Exchange-Server-Remote-Code-Execution.html [No Types Assigned] -
Initial Analysis by [email protected]
Nov. 10, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:S/C:P/I:P/A:P) Added CVSS V3.1 NIST AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Changed Reference Type https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42321 No Types Assigned https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42321 Patch, Vendor Advisory Added CWE NIST NVD-CWE-noinfo Added CPE Configuration OR *cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_21:*:*:*:*:*:* *cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_22:*:*:*:*:*:* *cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_10:*:*:*:*:*:* *cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_11:*:*:*:*:*:*
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-42321 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-42321
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
93.40 }} 0.14%
score
0.99800
percentile