CVE-2021-42321CISA KEVEPSS p99.8%

CVE-2021-42321Microsoft Exchange Server Remote Code Execution Vulnerability

Microsoft / Exchange

Description

An authenticated attacker could leverage improper validation in cmdlet arguments within Microsoft Exchange and perform remote code execution.

Scoring

EPSS90.39% probability of exploitation · percentile 99.8% · 2026-06-17T12:03:21Z

CISA KEV entry

Added to KEV: 2021-11-17

(incoming)1

TypeTargetConfidenceTier
KEVEntryMicrosoft Exchange Server Remote Code Execution Vulnerabilitykev-cve-2021-423210%live

Related by meaning· 6

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

CVE
Microsoft Exchange Server Information Disclosure Vulnerability
CVE
CVE-2026-45583
CVE
CVE-2023-21529
CVE
Microsoft Exchange Server Privilege Escalation Vulnerability
CVE
Microsoft Exchange Server Validation Key Remote Code Execution Vulnerability
CVE
CVE-2022-41080
Sourced from NVD + CISA KEV + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.