CVE-2018-8589KEV · OVERDUE

Microsoft Win32k Privilege Escalation Vulnerability

High · published November 14, 2018

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 87.4th percentile for exploit probability.

1593
days past CISA
deadline
CVSS v3.1
7.8
EPSS
3%
Percentile
87.4
In the wild
Confirmed
What it is

⚡ A sneaky elevation of privilege vulnerability lurks in Windows systems, threatening to turn your trusted server into a playground for attackers! 🔥 Think of this like a hotel clerk who accidentally gives away master keys to random guests. With improper handling in Win32k.sys, an attacker could gain full control, just like those guests could now access any room! If exploited, an attacker can elevate their privileges on the system, allowing them to run malicious code or access sensitive information that should be tightly locked away. This could lead to data breaches or even total system compromise!

Put simply

Think of this like a hotel clerk who accidentally gives away master keys to random guests. With improper handling in Win32k.sys, an attacker could gain full control, just like those guests could now access any room! This vulnerability arises from improper management of calls to Win32k.sys, enabling attackers to escalate their privileges on affected systems including Windows Server 2008, Windows 7, and Windows Server 2008 R2.

What to do

If exploited, an attacker can elevate their privileges on the system, allowing them to run malicious code or access sensitive information that should be tightly locked away. This could lead to data breaches or even total system compromise! Patch your systems immediately to the latest security updates provided by Microsoft. Ensure you’re running the latest version to mitigate this risk effectively. Regularly review your security practices to safeguard against similar vulnerabilities. You've got this! Stay vigilant and keep your systems 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
0.03023 · 87.4th percentile
Published
2018-11-14T01:00Z
KEV added
2022-05-23 · due 2022-06-13
EPSS history
Timeline
  • 23 MAY 00:00Z
    Added to CISA KEV — remediate by Jun 13
    kev
  • 14 NOV 01:00Z
    An elevation of privilege vulnerability exists when Windows improperly handles calls to Win32k.sys, aka "Windows Win32k Elevation of Privilege Vulnerability."…
    cvelistv5