Vulnerability in Microsoft Windows Server 2008 R2 Service Pack 1
CVE-2021-42278
Active Directory Domain Services Elevation of Privilege Vulnerability
EPSS: 0.941 (99.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C.
Affected products
- Microsoft Windows Server 2008 R2 Service Pack 1 — versions 6.1.0
- Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core Installation) — versions 6.0.0
- Microsoft Windows Server 2008 Service Pack 2 — versions 6.0.0
- Microsoft Windows Server 2008 Service Pack 2 — versions 6.0.0
- Microsoft Windows Server 2008 Service Pack 2 (Server Core Installation) — versions 6.0.0
- Microsoft Windows Server 2012 — versions 6.2.0
- Microsoft Windows Server 2012 R2 — versions 6.3.0
- Microsoft Windows Server 2012 R2 (Server Core Installation) — versions 6.3.0
- Microsoft Windows Server 2012 (Server Core Installation) — versions 6.2.0
- Microsoft Windows Server 2016 — versions 10.0.0
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
Required action: Apply updates per vendor instructions.
Known ransomware campaign use: yes.
Public proof-of-concept exploits
References
- portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42278 (x_refsource_MISC)
Frequently asked questions
- What is CVE-2021-42278?
- CVE-2021-42278 is a high-severity vulnerability in Microsoft Windows Server 2008 R2 Service Pack 1. CVSS score: 7.5/10. Published 2021-11-10.
- How severe is CVE-2021-42278?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2021-42278 known to be exploited?
- Yes. CVE-2021-42278 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-04-11), indicating it is being actively exploited. 183 public proof-of-concept repositories are indexed.