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CVE-2021-31196

7.2
HIGHCVSS v3.1 Base Score
3.34%
LOW RiskEPSS (88th percentile)
KEV
NVD-CWE-noinfo

Microsoft Exchange Server Remote Code Execution Vulnerability

Published: 7/14/2021
Modified: 10/29/2025
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ACTIVELY EXPLOITED IN THE WILD

This vulnerability is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

Vulnerability Name:

Microsoft Exchange Server Information Disclosure Vulnerability

Vendor / Product:

Microsoft Exchange Server

Required Action:

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Due Date: 9/11/2024(OVERDUE)
Added to KEV:

8/21/2024

Notes:

https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2021-31196; https://nvd.nist.gov/vuln/detail/CVE-2021-31196

Vulnerability Summary

CVSS v3 Score

7.2HIGH

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

CVSS v2 Score

6.5

AV:N/AC:L/Au:S/C:P/I:P/A:P

EPSS Score (Exploitation Probability)

3.34%LOW Exploitation Risk
88th percentile

This vulnerability has a 3.34% probability of being exploited in the next 30 days, ranking higher than 88% of all scored CVEs.

CWE Classification

NVD-CWE-noinfo

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