CVE-2021-42287

Microsoft Active Directory: Domain Services Privilege Escalation

As of , CVE-2021-42287 in Microsoft Active Directory is on CISA's list of exploited vulnerabilities: CISA listed it on . Our patch-first group: Patch this week.

Exploited
Yes: CISA listed it on 11 April 2022
US federal deadline
2 May 202221 days after CISA listed it. US federal civilian agencies must fix it by then.
Used in ransomware campaigns
Known
EPSS score
0.77Higher than 99% of the CVEs EPSS scores. EPSS estimates the chance of exploitation activity in the next 30 days.
EPSS when listed
0.02 on 11 April 2022EPSS on the day CISA listed it.
Public exploit
None foundNeither Metasploit nor Exploit-DB lists one.
Fix
No vendor link in CISA's entry

What CISA says to do

Apply updates per vendor instructions.

CISA's required action

What the flaw is

Microsoft Active Directory Domain Services contains an unspecified vulnerability that allows for privilege escalation.

CISA's description

Active Directory Domain Services Elevation of Privilege Vulnerability

The CVE record's description, from microsoft

CVE published
10 November 2021
Assigned by
microsoft
CVSS
7.5 High (CVSS 3.1, from the CNA)
CWE-269
Improper Privilege Management
CISA SSVC, exploitation
active
CISA SSVC, automatable
no
CISA SSVC, technical impact
total

Timeline

  1. The CVE record was published.
  2. CISA added it to its list of exploited vulnerabilities.
  3. The US federal deadline to fix it.

Active Directory: other exploited entries

VulnerabilityProductOur groupListedDeadlineEPSS
CVE-2022-26923Domain Services Privilege EscalationMicrosoft Active DirectoryPatch this weekMetasploit module; EPSS 0.840.84
CVE-2021-42278Domain Services Privilege EscalationMicrosoft Active DirectoryPatch this weekRansomware use; EPSS 0.730.73

Read further