What’s Vulnerable › Vulnerabilities

CVE-2020-0664: Active Directory Information Disclosure Vulnerability

• Severity: medium (CVSS 4.0 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 4.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-09-11 · updated 2026-06-17

Description

<p>An information disclosure vulnerability exists when Active Directory integrated DNS (ADIDNS) mishandles objects in memory. An authenticated attacker who successfully exploited this vulnerability would be able to read sensitive information about the target system.</p> <p>To exploit this condition, an authenticated attacker would need to send a specially crafted request to the AD|DNS service. Note that the information disclosure vulnerability by itself would not be sufficient for an attacker to compromise a system. However, an attacker could combine this vulnerability with additional vulnerabilities to further exploit the system.</p> <p>The update addresses the vulnerability by correcting how Active Directory integrated DNS (ADIDNS) handles objects in memory.</p>

Affected products

• Microsoft Windows Server 2008: all versions
• Microsoft Windows Server 2012: r2
• Microsoft Windows Server 2016: 1903, 1909, 2004
• Microsoft Windows Server 2019: all versions
• Microsoft Windows Server 2008 R2 Service Pack 1: from 6.1.0 before publication — fixed in publication
• Microsoft Windows Server 2008 Service Pack 2: from 6.0.0 before publication — fixed in publication
• Microsoft Windows Server 2012: from 6.2.0 before publication — fixed in publication
• Microsoft Windows Server 2012 R2: from 6.3.0 before publication — fixed in publication
• Microsoft Windows Server 2016: from 10.0.0 before publication — fixed in publication
• Microsoft Windows Server 2019: from 10.0.0 before publication — fixed in publication
• Microsoft Windows Server, version 1903 (Server Core installation): from 10.0.0 before publication — fixed in publication
• Microsoft Windows Server, version 1909 (Server Core installation): from 10.0.0 before publication — fixed in publication
• Microsoft Windows Server version 2004: from 10.0.0 before publication — fixed in publication

How to fix

Upgrade to a fixed version: Microsoft Windows Server 2008 R2 Service Pack 1 publication; Microsoft Windows Server 2008 Service Pack 2 publication; Microsoft Windows Server 2012 publication; Microsoft Windows Server 2012 R2 publication; Microsoft Windows Server 2016 publication; Microsoft Windows Server 2019 publication; Microsoft Windows Server, version 1903 (Server Core installation) publication; Microsoft Windows Server, version 1909 (Server Core installation) publication; Microsoft Windows Server version 2004 publication. Check the vendor advisory for mitigations.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0664
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0664

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