CVE-2026-63517

Analyzed Analyzed - Analysis Complete

Out-of-bounds Read in Microsoft Office

Publication date: 2026-08-11

Last updated on: 2026-08-13

Assigner: Microsoft Corporation

Description

Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information locally.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-08-11

Last Modified

2026-08-13

Generated

2026-09-01

AI Q&A

2026-08-12

EPSS Evaluated

2026-08-30

NVD

CVE-2026-63517

EUVD

EUVD-2026-56421

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	365_apps	*
microsoft	365_apps	*
microsoft	office_2019	*
microsoft	office_2016	*
microsoft	office_2016	*
microsoft	microsoft_365	*
microsoft	office_2021	*
microsoft	office_2021	*
microsoft	office_2021	*
microsoft	office_2024	*
microsoft	office_2024	*
microsoft	office_2024	*

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 is an out-of-bounds read vulnerability in Microsoft Office. It allows an unauthorized attacker to access and disclose information stored locally on a system by reading beyond the intended memory boundaries of the application.

Detection Guidance

This vulnerability is an out-of-bounds read in Microsoft Office that allows local information disclosure. Detection typically involves checking for unpatched versions of Microsoft Office or scanning for suspicious activity related to Office applications. Use Microsoft's official update tool to verify patch status: 'officec2rclient.exe /update user' or check via Windows Update settings.

Impact Analysis

An attacker could exploit this to read sensitive data from your system, such as files or memory contents, potentially exposing confidential information like documents or credentials.

Compliance Impact

This vulnerability allows unauthorized local disclosure of information, which could lead to unauthorized access to sensitive data. This may impact compliance with GDPR (data protection) and HIPAA (health information privacy) by increasing the risk of data breaches.

Mitigation Strategies

Apply the latest security updates from Microsoft for Office products as soon as they become available to patch the out-of-bounds read vulnerability.

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