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HIGH · 7.8

CVE-2026-21250

Untrusted pointer dereference in Windows HTTP.sys allows an authorized attacker to elevate privileges locally.

Vulnerability Description

Untrusted pointer dereference in Windows HTTP.sys allows an authorized attacker to elevate privileges locally.

CVSS Score

7.8

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH

Affected Products

VendorProductVersions
MicrosoftWindows 11 24H2< 10.0.26100.7781
MicrosoftWindows 11 25H2< 10.0.26200.7781
MicrosoftWindows Server 2022 23H2< 10.0.25398.2149
MicrosoftWindows Server 2025< 10.0.26100.32313

Related Weaknesses (CWE)

CWE-822

References

FAQ

What is CVE-2026-21250?

CVE-2026-21250 is a vulnerability with a CVSS score of 7.8 (HIGH). Untrusted pointer dereference in Windows HTTP.sys allows an authorized attacker to elevate privileges locally.

How severe is CVE-2026-21250?

CVE-2026-21250 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-21250?

Check the references section above for vendor advisories and patch information. Affected products include: Microsoft Windows 11 24H2, Microsoft Windows 11 25H2, Microsoft Windows Server 2022 23H2, Microsoft Windows Server 2025.