CVE-2025-21311CWE-303

Windows NTLM V1 Elevation of Privilege Vulnerability

Critical · published January 14, 2025

CVSS v3.1
9.8
EPSS
2%
Percentile
82.9
In the wild
Unconfirmed
What it is

🔥 A crafty elevation of privilege bug in Windows NTLM V1 could let attackers dance around security measures like they own the place! Think of it like a VIP pass that was accidentally given to the wrong person, granting them access to areas they shouldn't be in—like backstage at a concert. Once they’re in, they can do whatever they want! An attacker exploiting this vulnerability could gain unauthorized access to sensitive resources, change permissions, and wreak absolute havoc within the system. Imagine someone slipping past all security checks and having free rein to modify critical data or even disrupt operations—it could be absolutely devastating!

Put simply

Think of it like a VIP pass that was accidentally given to the wrong person, granting them access to areas they shouldn't be in—like backstage at a concert. Once they’re in, they can do whatever they want! This vulnerability arises from improper validation in Windows NTLM V1, allowing attackers to escalate their privileges if they have network access. Once they exploit this, they can impersonate other users or services, opening the door to a series of malicious actions.

What to do

An attacker exploiting this vulnerability could gain unauthorized access to sensitive resources, change permissions, and wreak absolute havoc within the system. Imagine someone slipping past all security checks and having free rein to modify critical data or even disrupt operations—it could be absolutely devastating! Immediately patch your systems to the latest version that addresses this vulnerability. Additionally, consider disabling NTLM V1 where possible and enforcing stronger authentication mechanisms. Regularly audit user permissions to ensure that no one has excessive privileges. 🔒 You've got this! By taking these steps, you can lock down your systems and keep the bad guys at bay! 🛡️

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
CVSS v4.0
Not supplied
EPSS
0.02262 · 82.9th percentile
Weakness
CWE-303 · Incorrect Implementation of Authentication Algorithm
Published
2025-01-14T18:04Z
EPSS history
Timeline
  • 14 JAN 18:04Z
    Windows NTLM V1 Elevation of Privilege Vulnerability
    cvelistv5