CVE-2021-33766

HIGHCVSS 7.3Known Exploited

CISA Known Exploited Vulnerability

https://nvd.nist.gov/vuln/detail/CVE-2021-33766

Remediation deadline: February 1, 2022

Description

Microsoft Exchange Server contains an information disclosure vulnerability which can allow an unauthenticated attacker to steal email traffic from target.

Timeline

Published:July 14th, 2021 6:15 PM

Last modified:August 10th, 2026 7:58 PM

Added to KEV:January 18th, 2022

CVSS Scoring

CVSS v3: 7.3 (HIGH)

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

CVSS v2: 5.0

Affected Software

From NVD CPE configuration data

Vendors

microsoft

Products

exchange_server

References & Reports

Advisories, patches, and third-party reports

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-33766Patch
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33766Patch
https://www.zerodayinitiative.com/advisories/ZDI-21-798/Third Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-33766US Government Resource

Source: NIST NVD · Data may lag official sources by up to one minute