CVE-2026-21250

EUVD-2026-7321
Untrusted pointer dereference in Windows HTTP.sys allows an authorized attacker to elevate privileges locally.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.8 HIGH
LOCAL
LOW
LOW
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
microsoftCNA
7.8 HIGH
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
Base Score
CVSS 3.x
EPSS Score
Percentile: 4%
Affected Products (NVD)
VendorProductVersion
microsoftwindows_11_24h2
𝑥
< 10.0.26100.7781
microsoftwindows_11_24h2
𝑥
< 10.0.26100.7781
microsoftwindows_11_25h2
𝑥
< 10.0.26200.7781
microsoftwindows_11_25h2
𝑥
< 10.0.26200.7781
microsoftwindows_server_2022_23h2
𝑥
< 10.0.25398.2149
microsoftwindows_server_2025
𝑥
< 10.0.26100.32313
𝑥
= Vulnerable software versions
Windows Releases
Platform
Version
Windows 11
24H2 (arm64, x64)
KB5077212
25H2 (arm64, x64)
KB5077212
26H1 (arm64, x64)
KB5077179
Windows Server 2022
23H2 Server Core
KB5075897
Windows Server 2025
Server Core
KB5075942
Standard
KB5075942
Common Weakness Enumeration
References
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21250