Active Directory Domain Services Elevation of Privilege Vulnerability
CVE-2021-42278

7.5HIGH

Key Information:

Vendor

Microsoft
Status
Windows Server 2019
Windows Server 2019 (server Core Installation)
Windows Server 2022
Windows Server Version 2004
Vendor
CVE Published:
10 November 2021

Badges

💰 Ransomware👾 Exploit Exists🟡 Public PoC🟣 EPSS 70%🦅 CISA Reported

What is CVE-2021-42278?

Active Directory Domain Services Elevation of Privilege Vulnerability

CISA has reported CVE-2021-42278

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 CVE-2021-42278 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)

Windows Server 2008 Service Pack 2 x64-based Systems 6.0.0 < 6.0.6003.21282

Windows Server 2008 R2 Service Pack 1 (Server Core installation) x64-based Systems 6.0.0 < 6.1.7601.25769

Windows Server 2008 R2 Service Pack 1 x64-based Systems 6.1.0 < 6.1.7601.25769

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.

sam-the-admin
Created by safebuffer

noPac
Created by Ridter

Pachine
Created by ly4k

References

https://portal.msrc.microsoft.com/en-US/security-guidance...
x_refsource_MISC

EPSS Score

70% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • 💰

    Used in Ransomware

  • 🦅

    CISA Reported

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.