CRITICAL🚩 CISA KEV⚡ EXPLOIT✓ PATCH🇵🇱 Wersja polska

CVE-2021-26855

CVSS 9.1v3.1pub. 2021-03-03upd. 2025-12-18

Microsoft Exchange Server Remote Code Execution Vulnerability

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

  • Microsoft Exchange Server

    APP
    Microsoft
    201320162019

CISA KEV — detailsi

Vendori
Microsoft ↗
Producti
Exchange Server
Added to KEVi
November 3, 2021
Remediation deadline (US Federal)i
May 3, 2022(overdue)
Ransomwarei
Active ransomware campaigns exploit this vulnerability
Required action (CISA)i

Apply updates per vendor instructions.

CISA descriptioni

Microsoft Exchange Server contains an unspecified vulnerability that allows for remote code execution. This vulnerability is part of the ProxyLogon exploit chain.

🔴
IMMEDIATE ACTION
Actively exploited in the wild (CISA KEV). Patch immediately.
☠️WYKORZYSTYWANE W RANSOMWARE⏰CISA DEADLINE: 3 maja 2022
Tags
RCE
CWE
References

Related vulnerabilities

CVE-2024-21410CRITICAL9.8⚠ KEVPL ✓ten sam produkt

Microsoft Exchange Server — privilege escalation z pominięciem uwierzytelnienia

CVE-2021-34523CRITICAL9.0⚠ KEVten sam produkt

Microsoft Exchange Server Elevation of Privilege Vulnerability

CVE-2021-34473CRITICAL9.1⚠ KEVten sam produkt

Microsoft Exchange Server Remote Code Execution Vulnerability

CVE-2023-21709CRITICAL9.8ten sam produkt

Microsoft Exchange Server Elevation of Privilege Vulnerability

CVE-2022-21846CRITICAL9.0ten sam produkt

Microsoft Exchange Server Remote Code Execution Vulnerability