CVE-2026-69827

Analyzed Analyzed - Analysis Complete

Race Condition in DNS Server Allows Remote Code Execution

Publication date: 2026-09-08

Last updated on: 2026-09-24

Assigner: Microsoft Corporation

Description

Concurrent execution using shared resource with improper synchronization ('race condition') in DNS Server allows an unauthorized attacker to execute code over a network.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-08

Last Modified

2026-09-24

Generated

2026-09-29

AI Q&A

2026-09-10

EPSS Evaluated

2026-09-27

NVD

CVE-2026-69827

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_server_2012	r2
microsoft	windows_server_2012	*
microsoft	windows_10_1607	to 10.0.14393.9512 (exc)
microsoft	windows_10_1607	to 10.0.14393.9512 (exc)
microsoft	windows_10_1809	to 10.0.17763.9245 (exc)
microsoft	windows_10_1809	to 10.0.17763.9245 (exc)
microsoft	windows_server_2025	to 10.0.26100.33438 (exc)
microsoft	windows_server_2016	to 10.0.14393.9512 (exc)
microsoft	windows_server_2019	to 10.0.17763.9245 (exc)
microsoft	windows_server_2022	to 10.0.20348.5622 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-362	The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.
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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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 race condition vulnerability in Microsoft DNS Server where improper synchronization during concurrent execution allows unauthorized attackers to execute code remotely over a network.

Impact Analysis

An attacker could exploit this to gain control of the DNS server, leading to potential data breaches, service disruption, or further network compromise.

Compliance Impact

This vulnerability could lead to unauthorized access or data exfiltration, violating confidentiality requirements in GDPR and HIPAA, potentially resulting in legal penalties and compliance failures.

Mitigation Strategies

Apply the latest security patches from Microsoft for the DNS Server to address the race condition. Monitor network traffic for unusual DNS queries or responses that may indicate exploitation attempts. Disable unnecessary DNS services if not in use and restrict access to DNS ports (typically 53) to trusted sources only.

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