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

CVE-2026-21250

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

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

HIGH · CVSS 7.8 EPSS 0.00655
Act now
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
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Weakness Classification

CWE-822Untrusted Pointer Dereference
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Affected Products & Versions

4
microsoft windows 11 24h2< 10.0.26100.7781
microsoft windows 11 25h2< 10.0.26200.7781
microsoft windows server 2022 23h2< 10.0.25398.2149
microsoft windows server 2025< 10.0.26100.32313
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Public Exploits & PoCs

1
localWindows 11 24H2 - Local Privilege Escalation2026-05-04
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Scoring & Timeline

7.8
HIGH · CVSS v3.1 · secure@microsoft.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD10 Feb 2026 · 06:16 PM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
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Vendor Advisories

1
msrcCVE-2026-21250Elevation of Privilege
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External lookups - second-class, for what we don’t hold ourselves
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