# CVE-2021-31196

Microsoft Exchange Server Remote Code Execution Vulnerability

- Page: https://www.vulneraibility.com/cve/CVE-2021-31196
- CVSS: 7.2
- Known exploited: yes, in CISA KEV since 2024-08-21; CISA due date 2024-09-11
- EPSS: 54.06% (percentile 99.0)
- CISA SSVC: exploitation active, automatable yes, technical impact total (assessed 2025-01-28)
- Published: 2021-07-14

## Affected versions

- Microsoft Microsoft Exchange Server 2013 Cumulative Update 23: affected >= 15.00.0 and < 15.00.1497.023
- Microsoft Microsoft Exchange Server 2016 Cumulative Update 20: affected >= 15.01.0 and < 15.01.2242.012
- Microsoft Microsoft Exchange Server 2016 Cumulative Update 21: affected >= 15.01.0 and < 15.01.2308.014
- Microsoft Microsoft Exchange Server 2019 Cumulative Update 10: affected >= 15.02.0 and < 15.02.0922.013
- Microsoft Microsoft Exchange Server 2019 Cumulative Update 9: affected >= 15.02.0 and < 15.02.0858.015

A version outside these ranges is not a statement that it is unaffected.

## References

- [patch] https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-31196
- [other] https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31196
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-31196

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.