CVE-2021-34473CISA KEVEPSS p100.0%

CVE-2021-34473Microsoft Exchange Server Remote Code Execution Vulnerability

Microsoft / Exchange Server

Description

Microsoft Exchange Server contains an unspecified vulnerability that allows for remote code execution.

Scoring

CVSS 9.1 ()
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS100.00% probability of exploitation · percentile 100.0% · 2026-09-26T12:00:22Z
Last modified2026-08-10

CISA KEV entry

Added to KEV: 2021-11-03

(incoming)1

TypeTargetConfidenceTier
KEVEntryMicrosoft Exchange Server Remote Code Execution Vulnerabilitykev-cve-2021-344730%live

Related by meaning· 6

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

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Microsoft Exchange Server Information Disclosure Vulnerability
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Microsoft Exchange Server Privilege Escalation Vulnerability
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CVE-2026-45583
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Microsoft Exchange Server Information Disclosure
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Microsoft Exchange Server Security Feature Bypass Vulnerability
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Microsoft Exchange Server Deserialization of Untrusted Data Vulnerability
Sourced from NVD + CISA KEV + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.