CVE-2026-103577
Microsoft QUIC Security Feature Bypass Vulnerability
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
Insecure default variable initialization in Microsoft QUIC allows an unauthorized attacker to bypass a security feature over a network.
| Vendor | microsoft |
| Product | windows 11 version 23h2 |
| Ecosystems | |
| Industries | TechnologyEnterprise |
| Published | Oct 13, 2026 |
| Last Updated | Oct 13, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:H/E:U/RL:O/RC:C Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Affected Versions
Microsoft / Windows 11 version 23H2
10.0.22631.0 < 10.0.22631.7652
Microsoft / Windows 11 Version 23H2
10.0.22631.0 < 10.0.22631.7652
Microsoft / Windows 11 Version 24H2
10.0.26100.0 < 10.0.26100.9711
Microsoft / Windows 11 Version 25H2
10.0.26200.0 < 10.0.26200.9711
Microsoft / Windows 11 version 26H1
10.0.28000.0 < 10.0.28000.3231
Microsoft / Windows 11 Version 26H2
10.0.26300.0 < 10.0.26300.9711
Microsoft / Windows Server 2022
10.0.20348.0 < 10.0.20348.5761
Microsoft / Windows Server 2025
10.0.26100.0 < 10.0.26100.33650
Microsoft / Windows Server 2025 (Server Core installation)
10.0.26100.0 < 10.0.26100.33650