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CVE-2021-26857— Microsoft Exchange Server Remote Code Execution Vulnerability

Quick assessment

Affected
Microsoft Microsoft Exchange Server 2010 Service Pack 3
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 安全漏洞。攻击者可构造恶意请求，触发反序列化漏洞，从而执行任意代码。成功利用该漏洞需要Exchange 管理员权限，或需要配合其他漏洞使用。以下产品和版本受到影响：Microsoft Exchange Server 2013 Cumulative Update 23,Microsoft

CVSS 7.8 · High KEV · Ransomware EPSS 95.76% · P100

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 26

VendorProduct Version RangeStatus
Microsoft Microsoft Exchange Server 2010 Service Pack 3 14.0.0.0< 14.03.0513.000 affected
Microsoft Microsoft Exchange Server 2013 Cumulative Update 21 15.00.0< 15.00.1395.012 affected
Microsoft Microsoft Exchange Server 2013 Cumulative Update 22 15.00.0< 15.00.1473.006 affected
Microsoft Microsoft Exchange Server 2013 Cumulative Update 23 15.00.0< 15.00.1497.012 affected
Microsoft Microsoft Exchange Server 2013 Service Pack 1 15.00.0< 15.00.0847.064 affected
Microsoft Microsoft Exchange Server 2016 Cumulative Update 10 15.01.0< 15.01.1531.012 affected
Microsoft Microsoft Exchange Server 2016 Cumulative Update 11 15.01.0< 15.01.1591.018 affected
Microsoft Microsoft Exchange Server 2016 Cumulative Update 12 15.01.0< 15.01.1713.010 affected
Microsoft Microsoft Exchange Server 2016 Cumulative Update 13 15.01.0< 15.01.1779.008 affected
Microsoft Microsoft Exchange Server 2016 Cumulative Update 14 15.01.0< 15.01.1847.012 affected
Microsoft Microsoft Exchange Server 2016 Cumulative Update 15 15.01.0< 15.01.1913.012 affected
Microsoft Microsoft Exchange Server 2016 Cumulative Update 16 15.01.0< 15.01.1979.008 affected
Microsoft Microsoft Exchange Server 2016 Cumulative Update 17 15.01.0< 15.01.2044.013 affected
Microsoft Microsoft Exchange Server 2016 Cumulative Update 18 15.01.0< 15.01.2106.013 affected
Microsoft Microsoft Exchange Server 2016 Cumulative Update 19 15.01.0< 15.01.2176.009 affected
Microsoft Microsoft Exchange Server 2016 Cumulative Update 8 15.01.0< 15.01.1415.010 affected
Microsoft Microsoft Exchange Server 2016 Cumulative Update 9 15.01.0< 15.01.1466.016 affected
Microsoft Microsoft Exchange Server 2019 15.02.0< 15.02.0221.018 affected
Microsoft Microsoft Exchange Server 2019 Cumulative Update 1 15.02.0< 15.01.1979.006 affected
Microsoft Microsoft Exchange Server 2019 Cumulative Update 2 15.02.0< 15.02.0397.011 affected
Microsoft Microsoft Exchange Server 2019 Cumulative Update 3 15.02.0< 15.02.0464.015 affected
Microsoft Microsoft Exchange Server 2019 Cumulative Update 4 15.02.0< 15.02.0659.012 affected
Microsoft Microsoft Exchange Server 2019 Cumulative Update 5 15.02.0< 15.02.0595.008 affected
Microsoft Microsoft Exchange Server 2019 Cumulative Update 6 15.02.0< 15.02.0529.013 affected
Microsoft Microsoft Exchange Server 2019 Cumulative Update 7 15.02.0< 15.02.0721.013 affected
Microsoft Microsoft Exchange Server 2019 Cumulative Update 8 15.02.0< 15.02.0792.010 affected
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I. Basic Information for CVE-2021-26857

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:L/AC:L/PR:N/UI:R/S:U/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 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 安全漏洞。攻击者可构造恶意请求，触发反序列化漏洞，从而执行任意代码。成功利用该漏洞需要Exchange 管理员权限，或需要配合其他漏洞使用。以下产品和版本受到影响：Microsoft Exchange Server 2013 Cumulative Update 23,Microsoft
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 2010 Service Pack 3 14.0.0.0 ~ 14.03.0513.000 -
Microsoft Microsoft Exchange Server 2013 Cumulative Update 21 15.00.0 ~ 15.00.1395.012 -
Microsoft Microsoft Exchange Server 2013 Cumulative Update 22 15.00.0 ~ 15.00.1473.006 -
Microsoft Microsoft Exchange Server 2013 Cumulative Update 23 15.00.0 ~ 15.00.1497.012 -
Microsoft Microsoft Exchange Server 2013 Service Pack 1 15.00.0 ~ 15.00.0847.064 -
Microsoft Microsoft Exchange Server 2016 Cumulative Update 10 15.01.0 ~ 15.01.1531.012 -
Microsoft Microsoft Exchange Server 2016 Cumulative Update 11 15.01.0 ~ 15.01.1591.018 -
Microsoft Microsoft Exchange Server 2016 Cumulative Update 12 15.01.0 ~ 15.01.1713.010 -
Microsoft Microsoft Exchange Server 2016 Cumulative Update 13 15.01.0 ~ 15.01.1779.008 -
Microsoft Microsoft Exchange Server 2016 Cumulative Update 14 15.01.0 ~ 15.01.1847.012 -
Microsoft Microsoft Exchange Server 2016 Cumulative Update 15 15.01.0 ~ 15.01.1913.012 -
Microsoft Microsoft Exchange Server 2016 Cumulative Update 16 15.01.0 ~ 15.01.1979.008 -
Microsoft Microsoft Exchange Server 2016 Cumulative Update 17 15.01.0 ~ 15.01.2044.013 -
Microsoft Microsoft Exchange Server 2016 Cumulative Update 18 15.01.0 ~ 15.01.2106.013 -
Microsoft Microsoft Exchange Server 2016 Cumulative Update 19 15.01.0 ~ 15.01.2176.009 -
Microsoft Microsoft Exchange Server 2016 Cumulative Update 8 15.01.0 ~ 15.01.1415.010 -
Microsoft Microsoft Exchange Server 2016 Cumulative Update 9 15.01.0 ~ 15.01.1466.016 -
Microsoft Microsoft Exchange Server 2019 15.02.0 ~ 15.02.0221.018 -
Microsoft Microsoft Exchange Server 2019 Cumulative Update 1 15.02.0 ~ 15.01.1979.006 -
Microsoft Microsoft Exchange Server 2019 Cumulative Update 2 15.02.0 ~ 15.02.0397.011 -
Microsoft Microsoft Exchange Server 2019 Cumulative Update 3 15.02.0 ~ 15.02.0464.015 -
Microsoft Microsoft Exchange Server 2019 Cumulative Update 4 15.02.0 ~ 15.02.0659.012 -
Microsoft Microsoft Exchange Server 2019 Cumulative Update 5 15.02.0 ~ 15.02.0595.008 -
Microsoft Microsoft Exchange Server 2019 Cumulative Update 6 15.02.0 ~ 15.02.0529.013 -
Microsoft Microsoft Exchange Server 2019 Cumulative Update 7 15.02.0 ~ 15.02.0721.013 -
Microsoft Microsoft Exchange Server 2019 Cumulative Update 8 15.02.0 ~ 15.02.0792.010 -

II. Public POCs for CVE-2021-26857

# POC Description Source Link Shenlong Link
1 proxylogon exploit - CVE-2021-26857 https://github.com/sirpedrotavares/Proxylogon-exploit POC Details
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III. Intelligence Information for CVE-2021-26857

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Vendor Advisories for CVE-2021-26857 (2)

Same Patch Batch · Microsoft · 2021-03-02 · 7 CVEs total

CVE-2021-27078 9.1 CRITICAL Microsoft Exchange Server Remote Code Execution Vulnerability
CVE-2021-26855 9.1 CRITICAL Microsoft Exchange Server Remote Code Execution Vulnerability
CVE-2021-26412 9.1 CRITICAL Microsoft Exchange Server Remote Code Execution Vulnerability
CVE-2021-27065 7.8 HIGH Microsoft Exchange Server Remote Code Execution Vulnerability
CVE-2021-26858 7.8 HIGH Microsoft Exchange Server Remote Code Execution Vulnerability
CVE-2021-26854 6.6 MEDIUM Microsoft Exchange Server Remote Code Execution Vulnerability

IV. Related Vulnerabilities

Same vendor: Microsoft

V. Comments for CVE-2021-26857

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