Microsoft Exchange Server Elevation of Privilege Vulnerability
CVE-2021-34523

9CRITICAL

Key Information:

Vendor: Microsoft
Status: Microsoft Exchange Server 2013 Cumulative Update 23; Microsoft Exchange Server 2019 Cumulative Update 9; Microsoft Exchange Server 2016 Cumulative Update 20; Microsoft Exchange Server 2016 Cumulative Update 19
Vendor: CVE Published:; 14 July 2021

Badges

💰 Ransomware👾 Exploit Exists🟡 Public PoC🟣 EPSS 95%🦅 CISA Reported

Summary

Microsoft Exchange Server Elevation of Privilege Vulnerability

CISA Reported

CISA provides regional cyber and physical services to support security and resilience across the United States. CISA monitor the most dangerious vulnerabilities and have identifed as being exploited and is known by the CISA as enabling ransomware campaigns.

The CISA's recommendation is: Apply updates per vendor instructions.

Affected Version(s)

Microsoft Exchange Server 2013 Cumulative Update 23 x64-based Systems 15.00.0 < 15.00.1497.015

Microsoft Exchange Server 2016 Cumulative Update 19 x64-based Systems 15.01.0 < 15.01.2176.012

Microsoft Exchange Server 2016 Cumulative Update 20 x64-based Systems 15.01.0 < 15.01.2242.008

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

ProxyShell_POC
Created by mithridates1313

CVE-2021-34523
Created by SUPRAAA-1337