CVE-2026-62881

Analyzed Analyzed - Analysis Complete

Numeric Truncation Error in Windows DNS Allows Privilege Escalation

Publication date: 2026-08-11

Last updated on: 2026-08-17

Assigner: Microsoft Corporation

Description

Numeric truncation error in Windows DNS allows an authorized attacker to elevate privileges locally.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-08-11

Last Modified

2026-08-17

Generated

2026-09-01

AI Q&A

2026-08-11

EPSS Evaluated

2026-08-30

NVD

CVE-2026-62881

EUVD

EUVD-2026-56682

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_21h2	to 10.0.19044.7663 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7663 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7663 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7663 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7663 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7663 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7517 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7517 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9106 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9106 (exc)
microsoft	windows_11_26h1	to 10.0.28000.2704 (exc)
microsoft	windows_11_26h1	to 10.0.28000.2704 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9106 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9106 (exc)
microsoft	windows_server_2016	to 10.0.14393.9418 (exc)
microsoft	windows_server_2022	to 10.0.20348.5440 (exc)
microsoft	windows_server_2025	to 10.0.26100.33222 (exc)
microsoft	windows_10_1809	to 10.0.17763.9121 (exc)
microsoft	windows_10_1809	to 10.0.17763.9121 (exc)
microsoft	windows_server_2019	to 10.0.17763.9121 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-197	Truncation errors occur when a primitive is cast to a primitive of a smaller size and data is lost in the conversion.
CWE-122	A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

Attack-Flow Graph

Executive Summary

This vulnerability is a numeric truncation error in Windows DNS that allows an authorized attacker to elevate their privileges locally. This means an attacker with some access could exploit this flaw to gain higher-level permissions on the system.

Detection Guidance

This vulnerability is a local elevation of privilege issue in Windows DNS. Detection requires checking for unauthorized privilege escalation attempts or unusual DNS service behavior. Review Windows Event Logs for security events related to privilege changes or DNS service modifications. Use commands like 'wevtutil qe System /q:"*[System[(EventID=4624 or EventID=4672 or EventID=4673)]]"' to check for privilege assignment events.

Impact Analysis

If exploited, this vulnerability could allow an attacker to gain elevated privileges on your system. This might let them perform unauthorized actions, install malicious software, or access sensitive data, depending on their goals.

Compliance Impact

This vulnerability allows local privilege escalation, which could enable unauthorized access to sensitive data or systems. This may impact compliance with GDPR (data protection) and HIPAA (health information security) by increasing the risk of data breaches or unauthorized access to protected information.

Mitigation Strategies

Apply the latest Windows DNS server updates from Microsoft to patch the numeric truncation error. Monitor Microsoft's security advisories for patches and install them promptly.

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