Known Exploited Vulnerability
9.8
CRITICAL
CVE-2021-34473
Microsoft Exchange Server Remote Code Execution Vu - [Actively Exploited]
Description

Microsoft Exchange Server Remote Code Execution Vulnerability

INFO

Published Date :

July 14, 2021, 6:15 p.m.

Last Modified :

July 26, 2024, 7:26 p.m.

Source :

[email protected]

Remotely Exploitable :

Yes !

Impact Score :

5.9

Exploitability Score :

3.9
CISA Notification
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.

Description :

Microsoft Exchange Server contains an unspecified vulnerability that allows for remote code execution.

Required Action :

Apply updates per vendor instructions.

Public PoC/Exploit Available at Github

CVE-2021-34473 has a 71 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

Affected Products

The following products are affected by CVE-2021-34473 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Microsoft exchange_server
: Total Affected Vendor : 1 | Products : 1
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-2021-34473.

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-2021-34473 Patch Vendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-821/ 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).

Profile Photo
CASIBOM-GIRIS-GIRIS-GUNCEL-CASIBOM/karma_v2

None

Shell

Updated: 1 month, 4 weeks ago
0 stars 0 fork 0 watcher
Born at : Sept. 22, 2024, 6:16 p.m. This repo has been linked 1 different CVEs too.
Profile Photo
sahar042/Shodan-IDOR

None

Updated: 2 months, 1 week ago
0 stars 0 fork 0 watcher
Born at : Aug. 29, 2024, 7:26 a.m. This repo has been linked 1 different CVEs too.
Profile Photo
apit-review-account/apit-tool

APIT is a CLI tool designed for API black-box vulnerability fuzzing. It captures API traffic via browser proxy and conducts deep recognition and mutation of API parameters in a tree structure. Additionally, APIV incorporates various optimization strategies to enhance the precision and efficiency of API vulnerability testing.

Updated: 4 months, 4 weeks ago
0 stars 0 fork 0 watcher
Born at : June 23, 2024, 5:23 a.m. This repo has been linked 105 different CVEs too.
Profile Photo
apif-review/APIF_tool_2024

APIF is a CLI tool designed for API black-box vulnerability testing. It captures API traffic via browser proxy and conducts deep recognition and mutation of API parameters in a tree structure. Additionally, APIV incorporates various optimization strategies to enhance the precision and efficiency of API vulnerability testing.

Updated: 7 months ago
0 stars 0 fork 0 watcher
Born at : April 15, 2024, 8:39 a.m. This repo has been linked 105 different CVEs too.
Profile Photo
apif-review/APIF_tool_2024

None

Updated: 7 months ago
0 stars 0 fork 0 watcher
Born at : April 15, 2024, 4:49 a.m. This repo has been linked 105 different CVEs too.
Profile Photo
NaInSec/CVE-PoC-in-GitHub

All CVE - PoC in GitHub

poc proofofconcept tester allcve cvegithub cvenew cvepoc cveupdate

Updated: 2 months, 3 weeks ago
5 stars 2 fork 2 watcher
Born at : March 22, 2024, 3:58 p.m. This repo has been linked 928 different CVEs too.
Profile Photo
zecool/cve

None

Updated: 8 months, 1 week ago
1 stars 0 fork 0 watcher
Born at : March 11, 2024, 1:21 p.m. This repo has been linked 930 different CVEs too.
Profile Photo
pwnlog/PuroAD

Collection of links for AD purple teamers.

Updated: 4 months, 2 weeks ago
0 stars 0 fork 0 watcher
Born at : Feb. 17, 2024, 2:49 p.m. This repo has been linked 16 different CVEs too.
Profile Photo
lions2012/Penetration_Testing_POC

渗透测试有关的POC、EXP、脚本、提权、小工具等---About penetration-testing python-script poc getshell csrf xss cms php-getshell domainmod-xss csrf-webshell cobub-razor cve rce sql sql-poc poc-exp bypass oa-getshell cve-cms

Assembly Python Shell PHP C++ C Go Ruby HTML Java

Updated: 3 months, 2 weeks ago
4 stars 0 fork 0 watcher
Born at : Feb. 7, 2024, 2:08 p.m. This repo has been linked 305 different CVEs too.
Profile Photo
youcans896768/APIV_Tool

APIV is a CLI tool designed for API black-box vulnerability testing. It captures API traffic via browser proxy and conducts deep recognition and mutation of API parameters in a tree structure. Additionally, APIV incorporates various optimization strategies to enhance the precision and efficiency of API vulnerability testing.

Updated: 9 months, 3 weeks ago
0 stars 0 fork 0 watcher
Born at : Jan. 31, 2024, 9:57 a.m. This repo has been linked 105 different CVEs too.
Profile Photo
anonymous364872/Rapier_Tool

Rapier is a CLI tool designed for API black-box vulnerability testing. It captures API traffic via browser proxy and conducts deep recognition and mutation of API parameters in a tree structure. Additionally, Rapier incorporates various optimization strategies to enhance the precision and efficiency of API vulnerability testing.

Updated: 4 months, 3 weeks ago
1 stars 0 fork 0 watcher
Born at : Jan. 10, 2024, 11:32 a.m. This repo has been linked 105 different CVEs too.
Profile Photo
f4alireza/CVE

Proxyshell for Exploiting CVE-2021-34473

C++ Python

Updated: 1 year, 1 month ago
0 stars 0 fork 0 watcher
Born at : Oct. 17, 2023, 8:38 a.m. This repo has been linked 1 different CVEs too.
Profile Photo
nitish778191/fitness_app

None

Updated: 3 months, 2 weeks ago
0 stars 0 fork 0 watcher
Born at : Sept. 4, 2023, 6:14 a.m. This repo has been linked 25 different CVEs too.
Profile Photo
HimmelAward/Goby_POC

在公网收集的gobypoc+部分自己加的poc

Updated: 2 months, 2 weeks ago
96 stars 5 fork 5 watcher
Born at : July 28, 2023, 4:28 p.m. This repo has been linked 296 different CVEs too.
Profile Photo
c0mrade12211/Pentests

data_from_pentest

Updated: 9 months, 1 week ago
2 stars 1 fork 1 watcher
Born at : May 9, 2023, 5:03 p.m. This repo has been linked 5 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-34473 vulnerability anywhere in the article.

  • 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

Published Date: Nov 13, 2024 (1 week, 1 day ago)
CVE-2023-4966 CVE-2023-34362 CVE-2023-27350 CVE-2022-47966 CVE-2022-42475 CVE-2022-26134 CVE-2021-4034 CVE-2021-44228 CVE-2021-40539 CVE-2021-34523 ...+4 more CVE
  • security.nl
VS publiceert overzicht van meest misbruikte kwetsbaarheden in 2023

De Amerikaanse autoriteiten hebben samen met cyberagentschappen uit Australië, Canada, Nieuw-Zeeland en het Verenigd Koninkrijk een overzicht van de meest misbruikte kwetsbaarheden in 2023 opgesteld. ... Read more

Published Date: Nov 12, 2024 (1 week, 2 days ago)
CVE-2023-6448 CVE-2023-49103 CVE-2023-22518 CVE-2023-20273 CVE-2023-20198 CVE-2023-4966 CVE-2023-44487 CVE-2023-22515 CVE-2023-42793 CVE-2023-41064 ...+36 more CVE
  • 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

Published Date: Sep 05, 2024 (2 months, 2 weeks ago)
CVE-2023-26360 CVE-2021-34523 CVE-2021-34473 CVE-2021-31207
  • 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

Published Date: Sep 05, 2024 (2 months, 2 weeks ago)
CVE-2023-26360 CVE-2021-34523 CVE-2021-34473 CVE-2021-31207
  • 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

Published Date: Jun 03, 2024 (5 months, 2 weeks ago)
CVE-2023-22518 CVE-2023-46604 CVE-2023-4966 CVE-2023-40044 CVE-2023-20269 CVE-2023-3519 CVE-2023-3539 CVE-2023-28252 CVE-2023-24880 CVE-2022-47966 ...+11 more CVE

The following table lists the changes that have been made to the CVE-2021-34473 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]

    Jul. 26, 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
    Changed Description Microsoft Exchange Server Remote Code Execution Vulnerability This CVE ID is unique from CVE-2021-31196, CVE-2021-31206. Microsoft Exchange Server Remote Code Execution Vulnerability
    Added CVSS V3.1 Microsoft Corporation AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
  • CWE Remap by [email protected]

    Jul. 12, 2022

    Action Type Old Value New Value
    Changed CWE NVD-CWE-noinfo CWE-918
  • 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
    Changed Reference Type https://www.zerodayinitiative.com/advisories/ZDI-21-821/ Third Party Advisory https://www.zerodayinitiative.com/advisories/ZDI-21-821/ 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. 19, 2021

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:C/I:C/A:C)
    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-2021-34473 No Types Assigned https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34473 Patch, Vendor Advisory
    Changed Reference Type https://www.zerodayinitiative.com/advisories/ZDI-21-821/ No Types Assigned https://www.zerodayinitiative.com/advisories/ZDI-21-821/ Third Party Advisory
    Added CWE NIST NVD-CWE-noinfo
    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-21-821/ [No Types Assigned]
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-34473 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-2021-34473 weaknesses.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

97.38 }} 0.03%

score

0.99934

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
: