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CVE-2026-83670

Last refreshed2026-10-15

Status: UPDATED  |  Advisory ID: CVE-2026-83670

Key Details

CVECVE-2026-83670
CVSS Score / Version
7.5 (High) / CVSS v3.1
Updated2026-10-13
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS Prose
attack vector is network; attack complexity is low; privileges required is none; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is none; availability impact is none.
Affected products
see table below
Classified as
CWE-125 (Out-of-bounds Read)

Affected Products, Subsystems & Sectors

VendorProductAffected VersionsPatch Status
MicrosoftWindows 11 (version 23H2)
MicrosoftWindows 11 (version 24H2)
MicrosoftWindows 11 (version 25H2)
MicrosoftWindows 11 (version 26H1)
MicrosoftWindows Server 2025
MicrosoftWindows 10 (version 1607)
MicrosoftWindows 10 (version 1809)
MicrosoftWindows 10 (version 21H2)
MicrosoftWindows 10 (version 22H2)
MicrosoftWindows Server 2012
MicrosoftWindows Server 2016
MicrosoftWindows Server 2019
MicrosoftWindows Server 2022
MicrosoftWindows Server 2012 R2
MicrosoftWindows 11 Version 26H2
SubsystemsOT Supporting Infrastructure
SectorsAll Sectors

What to Know

Out-of-bounds read in Function Discovery Service (fdwsd.dll) allows an unauthorized attacker to disclose information over a network.

What to Do

Monitor Microsoft's web page for any future patch releases.

References

SourceReference
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2026-83670
CVEhttps://www.cve.org/CVERecord?id=CVE-2026-83670
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