Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2021-26858— Microsoft Exchange Server Remote Code Execution Vulnerability

Quick assessment

Affected
Microsoft Microsoft Exchange Server 2013 Cumulative Update 21
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。攻击者通过Exchange服务器进行身份验证后，可以利用此漏洞将文件写入服务器上的任何路径。以下产品和版本受到影响：Microsoft Exchange Server 2016 Cumulative Update 19,Microsoft Exchange Server 201

CVSS 7.8 · High KEV · Ransomware EPSS 93.65% · P100

Affected Version Matrix 24

VendorProduct Version RangeStatus
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 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
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2021-26858

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

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 安全漏洞
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。攻击者通过Exchange服务器进行身份验证后，可以利用此漏洞将文件写入服务器上的任何路径。以下产品和版本受到影响：Microsoft Exchange Server 2016 Cumulative Update 19,Microsoft Exchange Server 201
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.

Read summary Full analysis (login)

Affected Products

Vendor Product Affected Versions CPE Subscribe
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 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-2021-26858

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2021-26858

请登录查看更多情报信息。

Vendor Advisories for CVE-2021-26858 (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-2021-26857 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 product: Microsoft Exchange Server 2013 Cumulative Update 21
Same vendor: Microsoft

V. Comments for CVE-2021-26858

No comments yet

Leave a comment