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CISA Known Exploited Vulnerability

This CVE is actively exploited in the wild. CISA mandates federal agencies to patch immediately.

CVE

CVE-2021-34473

9.1

CVSScritical

Exploitable remotely over the internet · no authentication required.

Attack Vector

Network

Privileges Req.

None

User Interaction

None

microsoft exchange server 2013 cumulative update 23microsoft exchange server 2016 cumulative update 19microsoft exchange server 2016 cumulative update 20microsoft exchange server 2019 cumulative update 8microsoft exchange server 2019 cumulative update 9

Updated Sep 26, 2026View on NVD →

S4E scanner

criticalProduct Based Web Vulnerabilities~10 seconds

CVE-2021-34473 Scanner

CVE-2021-34473 scanner - Remote Code Execution (RCE) vulnerability in Microsoft Exchange Server 2013, Microsoft Exchange Server 2019, Microsoft Exchange Server 2016

Used 3.2k times · 4.3k assets checked · url

Scanner page →Run scanner

CVE history: microsoft exchange server 2013 cumulative update 23

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