CVE-2025-21333KEV · OVERDUECWE-122

Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability

High · published January 14, 2025

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 95.6th percentile for exploit probability.

627
days past CISA
deadline
CVSS v3.1
7.8
EPSS
10%
Percentile
95.6
In the wild
Confirmed
What it is

🚨 A sneaky privilege elevation vulnerability in Windows Hyper-V could let attackers gain control without breaking a sweat! ⚡ Think of it like a hotel manager who forgets to check IDs when guests arrive — suddenly, anyone can waltz into the VIP lounge and access all the exclusive benefits. Here, attackers can exploit the vulnerability to gain elevated permissions and wreak havoc! If exploited, this vulnerability could allow an attacker to execute arbitrary code with elevated privileges, compromising the entire system. This means they could potentially modify system settings, install malicious software, or access sensitive data — absolutely devastating!

Put simply

Think of it like a hotel manager who forgets to check IDs when guests arrive — suddenly, anyone can waltz into the VIP lounge and access all the exclusive benefits. Here, attackers can exploit the vulnerability to gain elevated permissions and wreak havoc! This elevation of privilege vulnerability exists in the Windows Hyper-V NT Kernel Integration, where improper validation allows unauthorized users to gain access to system resources. Attackers could exploit this flaw by sending specially crafted requests to the hypervisor.

What to do

If exploited, this vulnerability could allow an attacker to execute arbitrary code with elevated privileges, compromising the entire system. This means they could potentially modify system settings, install malicious software, or access sensitive data — absolutely devastating! To patch this vulnerability, ensure your systems are updated to the latest version of Windows that includes the fix. Regularly monitor Microsoft's security updates and apply them as soon as possible to keep your systems secure. Don't forget to review your Hyper-V configurations for any other potential weaknesses! You've got this! With a little diligence, you can secure your systems and maintain your hero status! 🛡️

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
0.10066 · 95.6th percentile
Weakness
CWE-122 · Heap-based Buffer Overflow
Published
2025-01-14T18:04Z
KEV added
2025-01-14 · due 2025-02-04
EPSS history
Timeline
  • 14 JAN 18:04Z
    Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability
    cvelistv5
  • 14 JAN 00:00Z
    Added to CISA KEV — remediate by Feb 4
    kev