CVE-2026-62818

Analyzed Analyzed - Analysis Complete

Use After Free in Active Directory Certificate Services Allows Remote Code Execution

Publication date: 2026-08-11

Last updated on: 2026-08-16

Assigner: Microsoft Corporation

Description

Use after free in Active Directory Certificate Services (AD CS) allows an authorized attacker to execute code over a network.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-08-11

Last Modified

2026-08-16

Generated

2026-08-31

AI Q&A

2026-08-12

EPSS Evaluated

2026-08-30

NVD

CVE-2026-62818

EUVD

EUVD-2026-56395

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_server_2012	r2
microsoft	windows_server_2012	*
microsoft	windows_10_1607	to 10.0.14393.9418 (exc)
microsoft	windows_10_1607	to 10.0.14393.9418 (exc)
microsoft	windows_10_1809	to 10.0.17763.9115 (exc)
microsoft	windows_10_1809	to 10.0.17763.9115 (exc)
microsoft	windows_server_2016	to 10.0.14393.9418 (exc)
microsoft	windows_server_2019	to 10.0.17763.9115 (exc)
microsoft	windows_server_2022	to 10.0.20348.5440 (exc)
microsoft	windows_server_2025	to 10.0.26100.33222 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-416	The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Attack-Flow Graph

Executive Summary

This is a use after free vulnerability in Active Directory Certificate Services (AD CS). It allows an authorized attacker to execute arbitrary code remotely over a network by exploiting a memory corruption issue.

Detection Guidance

Detection requires monitoring for unusual activity in Active Directory Certificate Services (AD CS). Check for unexpected crashes or memory corruption in AD CS services. Review logs for unauthorized certificate requests or modifications. Use tools like Windows Event Viewer to inspect logs for Event ID 1000 (Application Error) or Event ID 4107 (Certificate Services).

Impact Analysis

An attacker could gain control of affected systems, steal sensitive data, install malware, or disrupt services. Since AD CS is critical for authentication and security in Windows environments, the impact could be severe for organizations using it.

Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, which may violate compliance requirements under GDPR, HIPAA, or other regulations. Organizations must address it to maintain data protection and security standards.

Mitigation Strategies

Apply the latest security updates from Microsoft for Active Directory Certificate Services as soon as possible to patch the use-after-free vulnerability.

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