CVE-2021-34473— Microsoft Exchange Server Remote Code Execution Vulnerability
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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: NVD (National Vulnerability Database)
Vulnerability Description
Microsoft Exchange Server Remote Code Execution Vulnerability
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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)
Shenlong Deep Dive — AI Deep Analysis
10-question deep dive: root cause, exploitation, mitigation, urgency. Read summary free, full version requires login.
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Microsoft | Microsoft Exchange Server 2013 Cumulative Update 23 | 15.00.0 ~ 15.00.1497.015 | cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_23:*:*:*:*:*:* | |
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 9 | 15.02.0 ~ 15.02.0858.010 | cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_9:*:*:*:*:*:* | |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 20 | 15.01.0 ~ 15.01.2242.008 | cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_20:*:*:*:*:*:* | |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 19 | 15.01.0 ~ 15.01.2176.012 | cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_19:*:*:*:*:*:* | |
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 8 | 15.02.0 ~ 15.02.0792.013 | cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_8:*:*:*:*:*:* |
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 |
AI-Generated POCPremium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2021-34473
请登录查看更多情报信息。
- https://www.zerodayinitiative.com/advisories/ZDI-21-821/x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2021-34473
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 | Dynamics 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 → →
IV. Related Vulnerabilities
Same product: Microsoft Exchange Server 2013 Cumulative Update 23
- CVE-2022-41078
Microsoft Exchange Server Spoofing Vulnerability - CVE-2022-41040
Microsoft Exchange Server Elevation of Privilege Vulnerabili - CVE-2022-41082
Microsoft Exchange Server Remote Code Execution Vulnerabilit - CVE-2022-24477
Microsoft Exchange Server Elevation of Privilege Vulnerabili - CVE-2022-21980
Microsoft Exchange Server Elevation of Privilege Vulnerabili
Same vendor: Microsoft
- CVE-2026-42826
Azure DevOps Information Disclosure Vulnerability - CVE-2026-35428
Azure Cloud Shell Spoofing Vulnerability - CVE-2026-35435
Azure AI Foundry Elevation of Privilege Vulnerability - CVE-2026-34327
Microsoft Partner Center Spoofing Vulnerability - CVE-2026-33844
Azure Managed Instance for Apache Cassandra Remote Code Exec
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