CVE-2026-21250
HIGHCVSS Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2Description
Untrusted pointer dereference in Windows HTTP.sys allows an authorized attacker to elevate privileges locally.
Analysis
Windows HTTP.sys contains an unsafe pointer dereference vulnerability that enables authenticated local attackers to escalate privileges on affected systems including Windows 11, Windows Server 2025, and related versions. An attacker with local user access can exploit this flaw to gain system-level privileges with high confidence in successful exploitation. …
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Remediation
Within 24 hours: Inventory all Windows servers running HTTP.sys and assess exposure in production environments; begin daily monitoring for exploitation attempts. Within 7 days: Implement network segmentation to restrict HTTP.sys service access and limit lateral movement; enforce strict access controls on authenticated accounts. …
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External POC / Exploit Code
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