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CVE-2021-42287

Active Directory Domain Services Elevation of Privilege Vulnerability

CVSS 7.5 HIGHEPSS 74.3%● KEV
Vexday Risk Score
93Fix now
SSVC decision (CISA)
Act
Exploitation + impact → act immediately
CVSS 7.5EPSS 74.3%KEV simPoC públicaNuclei Metasploit Patch
Lifecycle
10 Nov 2021Published on NVD
11 Dec 2021Public PoC
11 Apr 2022Active exploitation (CISA KEV)
Recommendation: Patch as soon as possible — active exploitation confirmed.
In short

A flaw in Active Directory Domain Services allows an attacker with network access to gain higher privileges on the system than they should have, potentially giving them control over critical domain resources.

Technical detail

A privilege escalation vulnerability in AD DS exploits insufficient validation of authentication requests, allowing a network-adjacent attacker to escalate privileges without requiring prior authenticated access. The vulnerability impacts the Kerberos authentication mechanism and can be leveraged to compromise domain controller integrity and domain-wide security.

Summary generated and translated by AI from the official description.
Active Directory Domain Services Elevation of Privilege Vulnerability
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
⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.

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