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CVE-2026-21533

exploited in the wild

CVSS

—

Reports

4

First seen

Feb 12

Last seen

May 7

Affected product

Windows Remote Desktop Services

Associated actors

APT28 ×1 Lotus Blossom ×1 UAT-8616 ×1 UNC6201 ×1

Recent reports

Exploits and vulnerabilities in Q1 2026

Kaspersky SecurelistMay 7 Critical

February 2026 CVE Landscape: 13 Critical Vulnerabilities, 43% Drop from January

Recorded Future InsiktMar 12 High

Microsoft Windows and Office Contain 5 High-Risk Security Vulnerabilities

NICS TaiwanFeb 26 High

Microsoft February 2026 Security Updates: Six Vulnerabilities Including In-The-Wild Exploits

JPCERT/CC AlertsFeb 12

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