CVE-2026-70277

Analyzed Analyzed - Analysis Complete

Out-of-Bounds Read in Windows Fast FAT Driver

Publication date: 2026-10-13

Last updated on: 2026-10-28

Assigner: Microsoft Corporation

Description

Out-of-bounds read in Windows Fast FAT Driver allows an unauthorized attacker to disclose information locally.

CVSS Scores

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Meta Information

Published

2026-10-13

Last Modified

2026-10-28

Generated

2026-11-08

AI Q&A

2026-10-13

EPSS Evaluated

2026-11-07

NVD

CVE-2026-70277

EUVD

EUVD-2026-99616

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_server_2012	r2
microsoft	windows_server_2012	*
microsoft	windows_10_1607	to 10.0.14393.9612 (exc)
microsoft	windows_10_1607	to 10.0.14393.9612 (exc)
microsoft	windows_10_1809	to 10.0.17763.9376 (exc)
microsoft	windows_10_1809	to 10.0.17763.9376 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7807 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7807 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7807 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7652 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7652 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9711 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9711 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9711 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9711 (exc)
microsoft	windows_11_26h1	to 10.0.28000.3231 (exc)
microsoft	windows_11_26h1	to 10.0.28000.3231 (exc)
microsoft	windows_11_26h2	to 10.0.26300.9711 (exc)
microsoft	windows_11_26h2	to 10.0.26300.9711 (exc)
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)
microsoft	windows_10_22h2	to 10.0.19045.7807 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7807 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7807 (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 is an out-of-bounds read vulnerability in the Windows Fast FAT Driver. It allows an unauthorized attacker to read memory outside the intended buffer, potentially exposing sensitive information stored in memory.

Detection Guidance

This vulnerability is an out-of-bounds read in the Windows Fast FAT Driver, which allows local information disclosure. Detection typically requires analyzing system logs or using Microsoft's vulnerability scanning tools rather than direct network commands.

Impact Analysis

An attacker could exploit this to disclose information locally on affected systems. This may include sensitive data like passwords or encryption keys, depending on what is stored in memory.

Compliance Impact

This vulnerability allows unauthorized local information disclosure due to an out-of-bounds read in the Windows Fast FAT Driver. Such information disclosure risks could potentially expose sensitive data, which may impact compliance with regulations like GDPR (data protection) or HIPAA (health information privacy) if the disclosed data includes protected information.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the Fast FAT Driver vulnerability. Monitor Microsoft's security advisories for updates and install them promptly.

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