by Kastro
Paper/Archive/CVE-2026-62815

CVE-2026-62815

Microsoft Windows 11 version 23H2 — Microsoft QUIC Remote Code Execution Vulnerability

EPSS 1.0%CVSS 9.8
critical.is priorityof 100
42
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 62.0.620 × 2012.4No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

Use after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network.

Affected

ProductAffectedFixed inSource
Windows 11 version 23H210.0.22631.0 – < 10.0.22631.751710.0.22631.7517CNA
Windows 11 Version 23H210.0.22631.0 – < 10.0.22631.751710.0.22631.7517CNA
Windows 11 Version 24H210.0.26100.0 – < 10.0.26100.916810.0.26100.9168CNA
Windows 11 Version 25H210.0.26200.0 – < 10.0.26200.916810.0.26200.9168CNA
Windows 11 version 26H110.0.28000.0 – < 10.0.28000.270410.0.28000.2704CNA
Windows Server 202210.0.20348.0 – < 10.0.20348.549910.0.20348.5499CNA
Windows Server 202510.0.26100.0 – < 10.0.26100.3329610.0.26100.33296CNA
Windows Server 2025 (Server Core installation)10.0.26100.0 – < 10.0.26100.3329610.0.26100.33296CNA

Scores by source

microsoft (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

patchmsrc.microsoft.com/update-guide/vulnerability/CVE-2026-62815