CVE-2026-21250CWE-822

Windows HTTP.sys Elevation of Privilege Vulnerability

High · published February 10, 2026

CVSS v3.1
7.8
EPSS
1%
Percentile
65.7
In the wild
Unconfirmed
What it is

⚡ An authorized attacker could exploit a tiny flaw in Windows HTTP.sys to elevate their privileges locally — like sneaking into the VIP section at a concert, but with far scarier motives! 🔥 Think of it like a restaurant where a server can access the kitchen but somehow finds a way to bypass all the checks and balances to take over the entire operation. This untrusted pointer dereference allows attackers to manipulate their access level, just like a rogue server commandeering the chef's duties! If exploited, an attacker could gain full control over the system, enabling them to perform any action they want, from stealing sensitive data to installing malicious software. It's a high-stakes game where a seemingly minor flaw could lead to a catastrophic breach!

Put simply

Think of it like a restaurant where a server can access the kitchen but somehow finds a way to bypass all the checks and balances to take over the entire operation. This untrusted pointer dereference allows attackers to manipulate their access level, just like a rogue server commandeering the chef's duties! This vulnerability arises from an untrusted pointer dereference in Windows HTTP.sys, which allows attackers to manipulate memory and gain higher privileges than intended, even if they are already authenticated users.

What to do

If exploited, an attacker could gain full control over the system, enabling them to perform any action they want, from stealing sensitive data to installing malicious software. It's a high-stakes game where a seemingly minor flaw could lead to a catastrophic breach! To protect against this vulnerability, ensure your systems are updated with the latest security patches from Microsoft. Review your security policies to limit access and monitor for any suspicious activity. It's better to be proactive than reactive! You’ve got this! With a few strategic updates and vigilance, you can lock this down and keep your systems safe! 🛡️

The record
Technical detail
CVSS v3.1
7.8 · HIGH
Vector
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
CVSS v4.0
Not supplied
EPSS
0.01111 · 65.7th percentile
Weakness
CWE-822 · Untrusted Pointer Dereference
Published
2026-02-10T17:51Z
EPSS history
Timeline
  • 10 FEB 17:51Z
    Windows HTTP.sys Elevation of Privilege Vulnerability
    cvelistv5