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CVE-2021-34473— Microsoft Exchange Server Remote Code Execution Vulnerability

Quick assessment

Affected
Microsoft Microsoft Exchange Server 2013 Cumulative Update 23
Exploitation
Confirmed exploitation in the wild; remediate immediately
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Microsoft Exchange Server是美国微软（Microsoft）公司的一套电子邮件服务程序。它提供邮件存取、储存、转发，语音邮件，邮件过滤筛选等功能。 Microsoft Exchange Server存在代码问题漏洞。以下产品和版本受到影响：Microsoft Exchange Server 2013 Cumulative Update 23,Microsoft Exchange Server 2019 Cumulative Update 9,Microsoft Exchange Se

CVSS 9.1 · Critical KEV · Ransomware EPSS 100.00% · P100

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 5

VendorProduct Version RangeStatus
Microsoft Microsoft Exchange Server 2013 Cumulative Update 23 15.00.0< 15.00.1497.015 affected
Microsoft Microsoft Exchange Server 2016 Cumulative Update 19 15.01.0< 15.01.2176.012 affected
Microsoft Microsoft Exchange Server 2016 Cumulative Update 20 15.01.0< 15.01.2242.008 affected
Microsoft Microsoft Exchange Server 2019 Cumulative Update 8 15.02.0< 15.02.0792.013 affected
Microsoft Microsoft Exchange Server 2019 Cumulative Update 9 15.02.0< 15.02.0858.010 affected
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I. Basic Information for CVE-2021-34473

Vulnerability Information
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Vulnerability Title
Microsoft Exchange Server Remote Code Execution Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Microsoft Exchange Server Remote Code Execution Vulnerability
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Exchange Server 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Exchange Server是美国微软（Microsoft）公司的一套电子邮件服务程序。它提供邮件存取、储存、转发，语音邮件，邮件过滤筛选等功能。 Microsoft Exchange Server存在代码问题漏洞。以下产品和版本受到影响：Microsoft Exchange Server 2013 Cumulative Update 23,Microsoft Exchange Server 2019 Cumulative Update 9,Microsoft Exchange Se
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
Microsoft Microsoft Exchange Server 2013 Cumulative Update 23 15.00.0 ~ 15.00.1497.015 -
Microsoft Microsoft Exchange Server 2016 Cumulative Update 19 15.01.0 ~ 15.01.2176.012 -
Microsoft Microsoft Exchange Server 2016 Cumulative Update 20 15.01.0 ~ 15.01.2242.008 -
Microsoft Microsoft Exchange Server 2019 Cumulative Update 8 15.02.0 ~ 15.02.0792.013 -
Microsoft Microsoft Exchange Server 2019 Cumulative Update 9 15.02.0 ~ 15.02.0858.010 -

II. Public POCs for CVE-2021-34473

# POC Description Source Link Shenlong Link
1 nuclei scanner for proxyshell ( CVE-2021-34473 ) https://github.com/cyberheartmi9/Proxyshell-Scanner POC Details
2 Scanner for CVE-2021-34473, ProxyShell, A Microsoft Exchange On-premise Vulnerability https://github.com/RaouzRouik/CVE-2021-34473-scanner POC Details
3 CVE-2021-34473 Microsoft Exchange Server Remote Code Execution Vulnerability https://github.com/phamphuqui1998/CVE-2021-34473 POC Details
4 Proof of Concept for CVE-2021-34473, CVE-2021-34523, and CVE-2021-31207 https://github.com/horizon3ai/proxyshell POC Details
5 对Exchange Proxyshell 做了二次修改，精确的拆分、实现辅助性安全测试。 https://github.com/je6k/CVE-2021-34473-Exchange-ProxyShell POC Details
6 A simple script to check for ProxyShell https://github.com/jrgdiaz/ProxyShell-CVE-2021-34473.py POC Details
7 CVE-2021-34473 Microsoft Exchange Server Remote Code Execution Vulnerability https://github.com/kh4sh3i/ProxyShell POC Details
8 A massive scanner for CVE-2021-34473 Microsoft Exchange Windows Vulnerability https://github.com/ipsBruno/CVE-2021-34473-NMAP-SCANNER POC Details
9 Proxyshell for Exploiting CVE-2021-34473 https://github.com/f4alireza/CVE POC Details
10 CVE-2021-34473 Microsoft Exchange Server Remote Code Execution Vulnerability https://github.com/p2-98/CVE-2021-34473 POC Details
11 A simple script to check for ProxyShell https://github.com/learningsurface/ProxyShell-CVE-2021-34473.py POC Details
12 Microsoft Exchange Server is vulnerable to a remote code execution vulnerability. This CVE ID is unique from CVE-2021-31196, CVE-2021-31206. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-34473.yaml POC Details
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III. Intelligence Information for CVE-2021-34473

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Vendor Advisories for CVE-2021-34473 (3)

Exploits & Public PoCs for CVE-2021-34473 (1)

Same Patch Batch · Microsoft · 2021-07-14 · 90 CVEs total

CVE-2021-34523 9.0 CRITICAL Microsoft Exchange Server Elevation of Privilege Vulnerability
CVE-2021-33749 8.8 HIGH Windows DNS Snap-in Remote Code Execution Vulnerability
CVE-2021-34508 8.8 HIGH Windows Kernel Remote Code Execution Vulnerability
CVE-2021-33780 8.8 HIGH Windows DNS Server Remote Code Execution Vulnerability
CVE-2021-33756 8.8 HIGH Windows DNS Snap-in Remote Code Execution Vulnerability
CVE-2021-34494 8.8 HIGH Windows DNS Server Remote Code Execution Vulnerability
CVE-2021-33752 8.8 HIGH Windows DNS Snap-in Remote Code Execution Vulnerability
CVE-2021-33750 8.8 HIGH Windows DNS Snap-in Remote Code Execution Vulnerability
CVE-2021-34525 8.8 HIGH Windows DNS Server Remote Code Execution Vulnerability
CVE-2021-34469 8.2 HIGH Microsoft Office Security Feature Bypass Vulnerability
CVE-2021-33767 8.2 HIGH Open Enclave SDK Elevation of Privilege Vulnerability
CVE-2021-33781 8.1 HIGH Azure AD Security Feature Bypass Vulnerability
CVE-2021-34492 8.1 HIGH Windows Certificate Spoofing Vulnerability
CVE-2021-34520 8.1 HIGH Microsoft SharePoint Server Remote Code Execution Vulnerability
CVE-2021-33786 8.1 HIGH Windows LSA Security Feature Bypass Vulnerability
CVE-2021-33779 8.1 HIGH Windows AD FS Security Feature Bypass Vulnerability
CVE-2021-33746 8.0 HIGH Windows DNS Server Remote Code Execution Vulnerability
CVE-2021-34474 8.0 HIGH Microsoft Dynamics 365 Business Central Remote Code Execution Vulnerability
CVE-2021-33754 8.0 HIGH Windows DNS Server Remote Code Execution Vulnerability
CVE-2021-34470 8.0 HIGH Microsoft Exchange Server Elevation of Privilege Vulnerability

Showing top 20 of 90 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Microsoft Exchange Server 2013 Cumulative Update 23
Same vendor: Microsoft

V. Comments for CVE-2021-34473

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