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CVE-2021-26427— Microsoft Exchange Server Remote Code Execution Vulnerability

Quick assessment

Affected
Microsoft Microsoft Exchange Server 2016 Cumulative Update 22
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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存在权限许可和访问控制问题漏洞。以下产品和版本受到影响：Microsoft Exchange Server 2016 Cumulative Update 21,Microsoft Exchange Server 2019 Cumulative Update 10,Microsoft Exc

CVSS 9.0 · Critical EPSS 0.89% · P58

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-26427

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:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Exchange Server 权限许可和访问控制问题漏洞
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存在权限许可和访问控制问题漏洞。以下产品和版本受到影响：Microsoft Exchange Server 2016 Cumulative Update 21,Microsoft Exchange Server 2019 Cumulative Update 10,Microsoft Exc
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)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Microsoft Microsoft Exchange Server 2016 Cumulative Update 22 15.0.0 ~ 15.01.2375.012 cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_22:*:*:*:*:*:*
Microsoft Microsoft Exchange Server 2019 Cumulative Update 11 15.02.0 ~ 15.02.0986.009 cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_11:*:*:*:*:*:*
Microsoft Microsoft Exchange Server 2013 Cumulative Update 23 15.00.0 ~ 15.00.1497.024 cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_23:*:*:*:*:*:*
Microsoft Microsoft Exchange Server 2016 Cumulative Update 21 15.01.0 ~ 15.01.2308.015 cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_21:*:*:*:*:*:*
Microsoft Microsoft Exchange Server 2019 Cumulative Update 10 15.02.0 ~ 15.02.0922.014 cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_10:*:*:*:*:*:*

II. Public POCs for CVE-2021-26427

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III. Intelligence Information for CVE-2021-26427

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Vendor Advisories for CVE-2021-26427 (1)

Same Patch Batch · Microsoft · 2021-10-13 · 71 CVEs total

CVE-2021-36970 8.8 HIGH Windows Print Spooler Spoofing Vulnerability
CVE-2021-40487 8.1 HIGH Microsoft SharePoint Server Remote Code Execution Vulnerability
CVE-2021-41344 8.1 HIGH Microsoft SharePoint Server Remote Code Execution Vulnerability
CVE-2021-38672 8.0 HIGH Windows Hyper-V Remote Code Execution Vulnerability
CVE-2021-40461 8.0 HIGH Windows Hyper-V Remote Code Execution Vulnerability
CVE-2021-41348 8.0 HIGH Microsoft Exchange Server Elevation of Privilege Vulnerability
CVE-2021-40464 8.0 HIGH Windows Nearby Sharing Elevation of Privilege Vulnerability
CVE-2021-40462 7.8 HIGH Windows Media Foundation Dolby Digital Atmos Decoders Remote Code Execution Vulnerability
CVE-2021-40466 7.8 HIGH Windows Common Log File System Driver Elevation of Privilege Vulnerability
CVE-2021-40449 7.8 HIGH Win32k Elevation of Privilege Vulnerability
CVE-2021-40450 7.8 HIGH Win32k Elevation of Privilege Vulnerability
CVE-2021-40443 7.8 HIGH Windows Common Log File System Driver Elevation of Privilege Vulnerability
CVE-2021-40473 7.8 HIGH Microsoft Excel Remote Code Execution Vulnerability
CVE-2021-40474 7.8 HIGH Microsoft Excel Remote Code Execution Vulnerability
CVE-2021-40477 7.8 HIGH Windows Event Tracing Elevation of Privilege Vulnerability
CVE-2021-40478 7.8 HIGH Storage Spaces Controller Elevation of Privilege Vulnerability
CVE-2021-40480 7.8 HIGH Microsoft Office Visio Remote Code Execution Vulnerability
CVE-2021-40485 7.8 HIGH Microsoft Excel Remote Code Execution Vulnerability
CVE-2021-40486 7.8 HIGH Microsoft Word Remote Code Execution Vulnerability
CVE-2021-40488 7.8 HIGH Storage Spaces Controller Elevation of Privilege Vulnerability

Showing top 20 of 71 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Microsoft Exchange Server 2016 Cumulative Update 22
Same vendor: Microsoft

V. Comments for CVE-2021-26427

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