CVE-2021-34523CISA KEVEPSS p100.0%

CVE-2021-34523Microsoft Exchange Server Privilege Escalation Vulnerability

Microsoft / Exchange Server

Description

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

Scoring

CVSS 9.0 ()
VectorCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
EPSS99.99% probability of exploitation · percentile 100.0% · 2026-09-07T12:00:22Z
Last modified2026-08-10

CISA KEV entry

Added to KEV: 2021-11-03

(incoming)1

TypeTargetConfidenceTier
KEVEntryMicrosoft Exchange Server Privilege Escalation Vulnerabilitykev-cve-2021-345230%live

Related by meaning· 6

Nearest entities by semantic similarity across the cs-graph corpus.

CVE
Microsoft Exchange Server Remote Code Execution Vulnerability
CVE
Microsoft Exchange Server Security Feature Bypass Vulnerability
CVE
Microsoft Exchange Server Information Disclosure Vulnerability
CVE
Microsoft Exchange Server Information Disclosure
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CVE-2025-59249
CVE
Microsoft Active Directory Domain Services Privilege Escalation Vulnerability
Sourced from NVD + CISA KEV + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.