Out-of-Bounds Read in Microsoft Office Outlook

Publication date: 2026-09-08

Last updated on: 2026-09-09

Assigner: Microsoft Corporation

Description

Out-of-bounds read in Microsoft Office Outlook allows an unauthorized attacker to disclose information over a network.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-08

Last Modified

2026-09-09

Generated

2026-09-29

AI Q&A

2026-09-09

EPSS Evaluated

2026-09-27

NVD

CVE-2026-80073

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	365_apps	*
microsoft	365_apps	*
microsoft	outlook	2016
microsoft	outlook	2016
microsoft	office_2019	*
microsoft	office_2019	*
microsoft	office_2021	*
microsoft	office_2021	*
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 vulnerability is an out-of-bounds read flaw in Microsoft Office Outlook. It allows an unauthorized attacker to access and disclose sensitive information over a network without needing special privileges or user interaction.

Impact Analysis

An attacker could exploit this to read memory contents outside the intended range, potentially accessing confidential data such as emails, attachments, or other sensitive information stored in Outlook.

Mitigation Strategies

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

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