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Home MicrosoftCVE-2021-34523

Critical

9.0CVSS

CVE-2021-34523

Vendor:Microsoft

Published: 14 Jul 2021

Updated 5mo ago

Generated remediation guidance and an executive summary. No account required.

Description

Microsoft Exchange Server Elevation of Privilege Vulnerability

CVSS Metrics

Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
Attack Vector: local
Complexity: low
Privileges: none
User Action: none
Scope: changed
Confidentiality: high
Integrity: high
Availability: none
Weaknesses: NVD-CWE-noinfo

Metadata

Primary Vendor: MICROSOFT
Published: 7/14/2021
Last Modified: 10/30/2025
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

microsoft : exchange_servermicrosoft : exchange_servermicrosoft : exchange_servermicrosoft : exchange_servermicrosoft : exchange_server

Remediation Guidance

Executive Summary

View on NIST NVD

Fix CVE-2021-34523 - CRITICAL microsoft exchange server | CVEDatabase.com

Related reading

Use Microsoft vendor hub and Exchange Server product page to widen CVE-2021-34523 into its surrounding weakness, vendor, and product context.

Compare it with CVE-2025-59249, CVE-2025-53782 and CVE-2025-53786 for nearby disclosures in the same product family. Additional editorial context is available in Weekly Security Roundup: Navigating the April 2026 Threat Landscape and Critical Framework Exploits.