CVE-2026-83635

Analyzed Analyzed - Analysis Complete

Out-of-Bounds Read in DNS Server

Publication date: 2026-10-13

Last updated on: 2026-10-16

Assigner: Microsoft Corporation

Description

Out-of-bounds read in DNS Server allows an unauthorized attacker to deny service over a network.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-10-13

Last Modified

2026-10-16

Generated

2026-10-19

AI Q&A

2026-10-14

EPSS Evaluated

2026-10-18

NVD

CVE-2026-83635

EUVD

EUVD-2026-99307

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_server_2012	r2
microsoft	windows_server_2012	*
microsoft	windows_server_2016	to 10.0.14393.9612 (exc)
microsoft	windows_server_2019	to 10.0.17763.9376 (exc)
microsoft	windows_server_2025	to 10.0.26100.33650 (exc)
microsoft	windows_server_2022	to 10.0.20348.5761 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-125	The product reads data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

Executive Summary

This vulnerability is an out-of-bounds read flaw in the DNS Server component of Microsoft Windows Server. It allows an unauthorized attacker to cause a denial of service by exploiting this memory access issue over a network.

Impact Analysis

An attacker could exploit this to disrupt DNS services, leading to network outages or degraded performance for systems relying on the affected Windows Server versions. This could impact business operations, user access, and service availability.

Compliance Impact

This vulnerability causes a denial of service via an out-of-bounds read in the DNS Server, which could disrupt critical network services. Such disruptions may lead to non-compliance with regulations like GDPR or HIPAA that require availability of personal or health data systems.

Mitigation Strategies

Apply the latest security updates from Microsoft for affected DNS Server versions to patch the out-of-bounds read vulnerability.

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