Actively exploited · Published Nov 10, 2021 · Assigned by microsoft
CVE-2021-42278Active Directory Domain Services Elevation of Privilege Vulnerability
High 7.5 Exploited Ransomware
In plain English
A high-severity security flaw in Windows Server 2008 R2 Service Pack 1 from Microsoft. Attackers are actively exploiting it in the wild (listed by CISA on April 11, 2022). It has been used in ransomware campaigns. The chance it is exploited in the next 30 days is estimated at 73.3% (higher than 99.5% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Apply updates per vendor instructions.
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)73.3%top 0.5% of all CVEs
Exploited in the wildYesCISA KEV since Apr 11, 2022
Attack tooling1Public PoC
CISA guidance
Apply updates per vendor instructions.
Federal agencies must remediate by May 2, 2022.
Official description
Active Directory Domain Services Elevation of Privilege Vulnerability
Affected products (as reported)
References
- Active Directory Domain Services Elevation of Privilege Vulnerability vendor-advisory, patch
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42278 x_refsource_MISC, x_transferred
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-42278 government-resource