CVE-2021-34523
Microsoft Exchange Server Privilege Escalation Vul - [Actively Exploited]
Description
Microsoft Exchange Server Elevation of Privilege Vulnerability
INFO
Published Date :
July 14, 2021, 6:15 p.m.
Last Modified :
Feb. 13, 2024, 5:20 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
5.9
Exploitability Score :
3.9
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.
Microsoft Exchange Server contains an unspecified vulnerability that allows for privilege escalation.
Apply updates per vendor instructions.
Public PoC/Exploit Available at Github
CVE-2021-34523 has a 32 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-2021-34523.
| URL | Resource |
|---|---|
| http://packetstormsecurity.com/files/163895/Microsoft-Exchange-ProxyShell-Remote-Code-Execution.html | Exploit Third Party Advisory VDB Entry |
| https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34523 | Patch Vendor Advisory |
| https://www.zerodayinitiative.com/advisories/ZDI-21-822/ | Third Party Advisory VDB Entry |
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).
Collection of links for AD purple teamers.
None
test-yaml
None
Shell
None
Shell
None
None
Shell
红队|域渗透重要漏洞汇总(持续更新)
None
None
Shell
A curated list of my GitHub Stars
CVE-2021-34473 Microsoft Exchange Server Remote Code Execution Vulnerability
Python
None
Dockerfile Python Shell CSS JavaScript HTML
None
Dockerfile Python Shell CSS JavaScript HTML
The great Microsoft exchange hack: A penetration tester’s guide (exchange penetration testing)
exchange mail pentest pentest-tool pentesting redteam exchange-server exploit zeroday
Python PowerShell 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-2021-34523 vulnerability anywhere in the article.
-
BleepingComputer
CISA says BianLian ransomware now focuses only on data theft
The BianLian ransomware operation has shifted its tactics, becoming primarily a data theft extortion group, according to an updated advisory from the U.S. Cybersecurity & Infrastructure Security Agenc ... Read more
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AttackIQ
Response to CISA Advisory (AA24-317A): 2023 Top Routinely Exploited Vulnerabilities
On November 12, 2024, the U.S. Cybersecurity & Infrastructure Security Agency (CISA) released a Cybersecurity Advisory (CSA) providing details on the Common Vulnerabilities and Exposures (CVEs) routin ... Read more
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The Hacker News
Chinese-Speaking Hacker Group Targets Human Rights Studies in Middle East
Unnamed government entities in the Middle East and Malaysia are the target of a persistent cyber campaign orchestrated by a threat actor known as Tropic Trooper since June 2023. "Sighting this group's ... Read more
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Kaspersky
Tropic Trooper spies on government entities in the Middle East
Executive summary Tropic Trooper (also known as KeyBoy and Pirate Panda) is an APT group active since 2011. This group has traditionally targeted sectors such as government, healthcare, transportation ... Read more
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Google Cloud
Ransomware Rebounds: Extortion Threat Surges in 2023, Attackers Rely on Publicly Available and Legitimate Tools
Written by: Bavi Sadayappan, Zach Riddle, Jordan Nuce, Joshua Shilko, Jeremy Kennelly A version of this blog post was published to the Mandiant Advantage portal on April 18, 2024. Executive Summary In ... Read more
The following table lists the changes that have been made to the
CVE-2021-34523 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.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Modified Analysis by [email protected]
Feb. 13, 2024
Action Type Old Value New Value -
CVE Modified by [email protected]
Dec. 28, 2023
Action Type Old Value New Value Changed Description Microsoft Exchange Server Elevation of Privilege Vulnerability This CVE ID is unique from CVE-2021-33768, CVE-2021-34470. Microsoft Exchange Server Elevation of Privilege Vulnerability Added CVSS V3.1 Microsoft Corporation AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N -
CWE Remap by [email protected]
Jul. 12, 2022
Action Type Old Value New Value Changed CWE CWE-269 CWE-287 -
Modified Analysis by [email protected]
Sep. 21, 2021
Action Type Old Value New Value Changed Reference Type http://packetstormsecurity.com/files/163895/Microsoft-Exchange-ProxyShell-Remote-Code-Execution.html No Types Assigned http://packetstormsecurity.com/files/163895/Microsoft-Exchange-ProxyShell-Remote-Code-Execution.html Exploit, Third Party Advisory, VDB Entry -
CVE Modified by [email protected]
Aug. 20, 2021
Action Type Old Value New Value Added Reference http://packetstormsecurity.com/files/163895/Microsoft-Exchange-ProxyShell-Remote-Code-Execution.html [No Types Assigned] -
Initial Analysis by [email protected]
Jul. 22, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:P/I:P/A:P) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Changed Reference Type https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34523 No Types Assigned https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34523 Patch, Vendor Advisory Changed Reference Type https://www.zerodayinitiative.com/advisories/ZDI-21-822/ No Types Assigned https://www.zerodayinitiative.com/advisories/ZDI-21-822/ Third Party Advisory, VDB Entry Added CWE NIST CWE-269 Added CPE Configuration OR *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:2016:cumulative_update_20:*:*:*:*:*:* *cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_8:*:*:*:*:*:* *cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_9:*:*:*:*:*:* -
CVE Modified by [email protected]
Jul. 19, 2021
Action Type Old Value New Value Added Reference https://www.zerodayinitiative.com/advisories/ZDI-21-822/ [No Types Assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-34523 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-2021-34523
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
84.81 }} 2.72%
score
0.98611
percentile