CVE-2024-21338KEV · OVERDUECWE-822

Microsoft Windows Kernel Exposed IOCTL with Insufficient Access Control Vulnerability

High · published February 13, 2024

Patch now

Confirmed exploited, and the score agrees

CVSS calls it high at 7.8. It is confirmed in active exploitation. It sits in the 99.1th percentile for exploit probability.

944
days past CISA
deadline
CVSS v3.1
7.8
EPSS
60%
Percentile
99.1
In the wild
Confirmed
What it is

🚨 A sneaky elevation of privilege in the Windows Kernel means bad actors can leap from a lowly user to admin status with just a bit of clever trickery! ⚡️ Think of it like a guest at a hotel who finds a way to sneak into the staff-only areas. With the right knowledge, they can access the manager’s office and start changing policies. This vulnerability is a gateway that enables unauthorized users to gain control over sensitive system functions. If exploited, an attacker could gain full control over the system, leading to unauthorized data access, installation of malicious software, or even complete system takeover. This can be absolutely devastating for your security posture and could leave sensitive information vulnerable to theft or manipulation.

Put simply

Think of it like a guest at a hotel who finds a way to sneak into the staff-only areas. With the right knowledge, they can access the manager’s office and start changing policies. This vulnerability is a gateway that enables unauthorized users to gain control over sensitive system functions. This vulnerability allows an attacker to execute code with elevated privileges due to improper validation in the Windows Kernel, essentially bypassing the standard security checks that keep user actions in check.

What to do

If exploited, an attacker could gain full control over the system, leading to unauthorized data access, installation of malicious software, or even complete system takeover. This can be absolutely devastating for your security posture and could leave sensitive information vulnerable to theft or manipulation. To protect yourself, immediately install the latest security updates released by Microsoft. Monitor your systems for unusual activity and consider tightening user permissions to limit the potential impact of this vulnerability. You've got this! By staying proactive and following these steps, you'll fortify your defenses and help keep your environment secure. 🛡️

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
CVSS v4.0
Not supplied
EPSS
0.59810 · 99.1th percentile
Weakness
CWE-822 · Untrusted Pointer Dereference
Published
2024-02-13T23:15Z
KEV added
2024-03-04 · due 2024-03-25
Affected products (9)
ProductVersionsFixed in
microsoft/windows_10_1809< 10.0.17763.545810.0.17763.5458
microsoft/windows_10_21h2< 10.0.19044.404610.0.19044.4046
microsoft/windows_10_22h2< 10.0.19045.404610.0.19045.4046
microsoft/windows_11_21h2< 10.0.22000.277710.0.22000.2777
microsoft/windows_11_22h2< 10.0.22621.315510.0.22621.3155
microsoft/windows_11_23h2< 10.0.22631.315510.0.22631.3155
microsoft/windows_server_2019< 10.0.17763.545810.0.17763.5458
microsoft/windows_server_2022< 10.0.20348.232210.0.20348.2322
microsoft/windows_server_2022_23h2≤ 10.0.25398.709—
References (6)
EPSS history
Timeline
  • 04 MAR 00:00Z
    Added to CISA KEV — remediate by Mar 25
    kev
  • 13 FEB 18:02Z
    Windows Kernel Elevation of Privilege Vulnerability
    cvelistv5