CVE-2021-31206
highpriority · track · 37EPSS 0.130 · 96 %ileDEEURUUSEPSS · scored 2026-10-27
Microsoft Exchange Server Remote Code Execution Vulnerability
remediations
Vendor fix, mitigation, or workaround guidance, as published by each source.
A vendor fix is available.
- FixedMicrosoft Exchange Server 2013 Cumulative Update 23msrc_csaf
15.00.1497.023:Security Update:https://support.microsoft.com/help/5004778
https://support.microsoft.com/help/5004778 - FixedMicrosoft Exchange Server 2016 Cumulative Update 20msrc_csaf
15.01.2242.012:Security Update:https://support.microsoft.com/help/5004779
https://support.microsoft.com/help/5004779 - FixedMicrosoft Exchange Server 2016 Cumulative Update 21msrc_csaf
15.01.2308.014:Security Update:https://support.microsoft.com/help/5004779
https://support.microsoft.com/help/5004779 - FixedMicrosoft Exchange Server 2019 Cumulative Update 10msrc_csaf
15.02.0922.013:Security Update:https://support.microsoft.com/help/5004780
https://support.microsoft.com/help/5004780 - FixedMicrosoft Exchange Server 2019 Cumulative Update 9msrc_csaf
15.02.0858.015:Security Update:https://support.microsoft.com/help/5004780
https://support.microsoft.com/help/5004780
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (28)
Products and version ranges known to be affected.
- Microsoft Exchange Server 2013 Cumulative Update 23all versionscert_bundDEcpe:/a:microsoft:exchange_server_2013::cumulative_update_23
- Microsoft Exchange Server 2016 Cumulative Update 19all versionscert_bundDEcpe:/a:microsoft:exchange_server_2016:cumulative_update_19
- Microsoft Exchange Server 2016 Cumulative Update 20all versionscert_bundDEcpe:/a:microsoft:exchange_server_2016:cumulative_update_20
- Microsoft Exchange Server 2019 Cumulative Update 8all versionscert_bundDEcpe:/a:microsoft:exchange_server_2019:cumulative_update_8
- Microsoft Exchange Server 2019 Cumulative Update 9all versionscert_bundDEcpe:/a:microsoft:exchange_server_2019:cumulative_update_9
advisories (2)
Vendor and ecosystem advisories describing this.
- WID-SEC-W-2024-1897Microsoft Exchange Server: Mehrere SchwachstellenDeutsch2021-07-13csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Microsoft Exchange Server 2013, Microsoft Exchange Server 2016 und Microsoft Exchange Server 2019 ausnutzen, um beliebigen Programmcode auszuführen, um seine Privilegien zu erhöhen und um Informationen offenzulegen.
- msrc_CVE-2021-31206Microsoft Exchange Server Remote Code Execution Vulnerability2021-07-13csaf · msrc_csafUS
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
also known as (5)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (10)
External citations — patches, advisories, analysis.
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-31206cnnvd
- https://nvd.nist.gov/vuln/detail/CVE-2021-31206cnnvd
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31206cnnvd
- https://vigilance.fr/vulnerability/Microsoft-Exchange-Server-vulnerabilities-of-July-2021-35886cnnvd
- https://www.cybersecurity-help.cz/vdb/SB2021071319cnnvd
- https://www.zerodayinitiative.com/advisories/ZDI-21-826/cnnvd
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-31206enisa_euvd
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-31206nvd
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