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CVE-2026-103577

Last refreshed2026-10-15

Status: UPDATED  |  Advisory ID: CVE-2026-103577

Key Details

CVECVE-2026-103577
CVSS Score / Version
7.5 (High) / CVSS v3.1
Updated2026-10-13
CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:H
CVSS Prose
attack vector is network; attack complexity is high; privileges required is none; user interaction is none; scope is changed; confidentiality impact is none; integrity impact is low; availability impact is high.
Affected products
see table below
Classified as
CWE-453 (Insecure Default Variable Initialization)

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 Server 2022
MicrosoftWindows 11 Version 26H2
SubsystemsOT Supporting Infrastructure
SectorsAll Sectors

What to Know

Insecure default variable initialization in Microsoft QUIC allows an unauthorized attacker to bypass a security feature 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-2026-103577
CVEhttps://www.cve.org/CVERecord?id=CVE-2026-103577

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