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CVE-2021-26857

Known Exploited (CISA KEV)HIGH
7.8
CVSS Severity Score
EPSS Score82.3420%
EPSS Percentile92.44th
PublishedMar 3, 2021
Last ModifiedDec 18, 2025

Vulnerability Description

Microsoft Exchange Server Remote Code Execution Vulnerability

Affected Platforms (CPE)

📦
Microsoft

Exchange Server

= 2010
📦
Microsoft

Exchange Server

= 2013
📦
Microsoft

Exchange Server

= 2013
📦
Microsoft

Exchange Server

= 2013
📦
Microsoft

Exchange Server

= 2016
📦
Microsoft

Exchange Server

= 2016
📦
Microsoft

Exchange Server

= 2016
📦
Microsoft

Exchange Server

= 2016
📦
Microsoft

Exchange Server

= 2016
📦
Microsoft

Exchange Server

= 2016
📦
Microsoft

Exchange Server

= 2016
📦
Microsoft

Exchange Server

= 2016
📦
Microsoft

Exchange Server

= 2016
📦
Microsoft

Exchange Server

= 2016
📦
Microsoft

Exchange Server

= 2016
📦
Microsoft

Exchange Server

= 2016
📦
Microsoft

Exchange Server

= 2019
📦
Microsoft

Exchange Server

= 2019
📦
Microsoft

Exchange Server

= 2019
📦
Microsoft

Exchange Server

= 2019
📦
Microsoft

Exchange Server

= 2019
📦
Microsoft

Exchange Server

= 2019
📦
Microsoft

Exchange Server

= 2019
📦
Microsoft

Exchange Server

= 2019
📦
Microsoft

Exchange Server

= 2019

References & Advisories

🔗 https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26857
🔗 https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26857
🔗 https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26857

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