🔴

CISA Known Exploited Vulnerability

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

CVE

CVE-2021-33766

7.3

CVSShigh

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 Oct 24, 2026View on NVD →

S4E scanner

highProduct Based Web Vulnerabilities~10 seconds

CVE-2021-33766 Scanner

CVE-2021-33766 Scanner - Unauthorized Admin Access vulnerability in Microsoft Exchange Server

Used 2.2k times · 3.4k assets checked · domain, subdomain, ipv4

Scanner page →Run scanner

CVE history: microsoft exchange server 2013 cumulative update 23

Predict next CVE date with AI

Monitor this CVE on your assets

S4E maps published CVEs to scanners and forecasts the next disclosure window for your stack.

Create a free account →