CVE-2026-62815: CWE-416: Use After Free in Microsoft Windows 11 version 23H2
Use after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network.
AI Analysis
Technical Summary
This vulnerability, identified as CWE-416 (Use After Free), exists in the Microsoft QUIC implementation on Windows 11 version 23H2 (build 10.0.22631.0). It enables an attacker without privileges or user interaction to execute arbitrary code remotely by exploiting a use-after-free condition. The CVSS v3.1 base score is 9.8, indicating critical severity with high impact on confidentiality, integrity, and availability. Microsoft has released an official fix for this vulnerability as documented in their security update guide.
Potential Impact
Successful exploitation allows remote code execution by an unauthenticated attacker, potentially leading to full system compromise including complete loss of confidentiality, integrity, and availability on affected Windows 11 systems.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62815 to remediate this vulnerability.
CVE-2026-62815: CWE-416: Use After Free in Microsoft Windows 11 version 23H2
Description
Use after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network.
CVSS v3.1
Score 9.8critical
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability, identified as CWE-416 (Use After Free), exists in the Microsoft QUIC implementation on Windows 11 version 23H2 (build 10.0.22631.0). It enables an attacker without privileges or user interaction to execute arbitrary code remotely by exploiting a use-after-free condition. The CVSS v3.1 base score is 9.8, indicating critical severity with high impact on confidentiality, integrity, and availability. Microsoft has released an official fix for this vulnerability as documented in their security update guide.
Potential Impact
Successful exploitation allows remote code execution by an unauthenticated attacker, potentially leading to full system compromise including complete loss of confidentiality, integrity, and availability on affected Windows 11 systems.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62815 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-07-14T21:08:07.966Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62815","vendor":"Microsoft"}]
Threat ID: 6a7b581abf8831d539156035
Added to database: 08/11/2026, 17:12:58 UTC
Last enriched: 08/11/2026, 21:27:17 UTC
Last updated: 08/12/2026, 02:41:11 UTC
Views: 7
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