CVE-2021-33766

7.3 HIGH CISA KEV - Actively Exploited
Published: July 14, 2021 Modified: October 29, 2025
View on NVD

Description

Microsoft Exchange Server Information Disclosure Vulnerability

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33766
Source: secure@microsoft.com
Patch Vendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-798/
Source: secure@microsoft.com
Third Party Advisory VDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33766
Source: af854a3a-2127-422b-91ae-364da2661108
Patch Vendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-798/
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory VDB Entry
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-33766
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
US Government Resource

5 reference(s) from NVD

Quick Stats

CVSS v3 Score
7.3 / 10.0
EPSS (Exploit Probability)
93.5%
100th percentile
Exploitation Status
Actively Exploited
Remediation due: 2022-02-01

Affected Vendors

microsoft