CVE-2021-34523

CRITICALCVSS 9.0Known Exploited

CISA Known Exploited Vulnerability

https://nvd.nist.gov/vuln/detail/CVE-2021-34523

Remediation deadline: November 17, 2021

Ransomware use: Known

Description

Microsoft Exchange Server contains an unspecified vulnerability that allows for privilege escalation.

Timeline

Published:July 14th, 2021 6:15 PM

Last modified:August 10th, 2026 7:59 PM

Added to KEV:November 3rd, 2021

CVSS Scoring

CVSS v3: 9.0 (CRITICAL)

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

CVSS v2: 7.5

Affected Software

From NVD CPE configuration data

Vendors

microsoft

Products

exchange_server

References & Reports

Advisories, patches, and third-party reports

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