CVE-2026-21240
7.8
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Summary
Time-of-check time-of-use (toctou) race condition in Windows HTTP.sys allows an authorized attacker to elevate privileges locally.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Microsoft | Windows 10 Version 1809 | 10.0.17763.0 < 10.0.17763.8389 | affected |
| Microsoft | Windows 10 Version 21H2 | 10.0.19044.0 < 10.0.19044.6937 | affected |
| Microsoft | Windows 10 Version 22H2 | 10.0.19045.0 < 10.0.19045.6937 | affected |
| Microsoft | Windows 11 version 22H3 | 10.0.22631.0 < 10.0.22631.6649 | affected |
| Microsoft | Windows 11 Version 23H2 | 10.0.22631.0 < 10.0.22631.6649 | affected |
| Microsoft | Windows 11 Version 24H2 | 10.0.26100.0 < 10.0.26100.7840 | affected |
| Microsoft | Windows 11 Version 25H2 | 10.0.26200.0 < 10.0.26200.7840 | affected |
| Microsoft | Windows 11 version 26H1 | 10.0.28000.0 < 10.0.28000.1575 | affected |
| Microsoft | Windows 11 Version 26H1 | 10.0.28000.0 < 10.0.28000.1575 | affected |
| Microsoft | Windows Server 2019 | 10.0.17763.0 < 10.0.17763.8389 | affected |
| Microsoft | Windows Server 2019 (Server Core installation) | 10.0.17763.0 < 10.0.17763.8389 | affected |
| Microsoft | Windows Server 2022 | 10.0.20348.0 < 10.0.20348.4773 | affected |
| Microsoft | Windows Server 2022, 23H2 Edition (Server Core installation) | 10.0.25398.0 < 10.0.25398.2149 | affected |
| Microsoft | Windows Server 2025 | 10.0.26100.0 < 10.0.26100.32370 | affected |
| Microsoft | Windows Server 2025 (Server Core installation) | 10.0.26100.0 < 10.0.26100.32370 | affected |
Weaknesses
- CWE-367: CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: total
References
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