CVE-2019-0803KEV · OVERDUE

Microsoft Win32k Privilege Escalation Vulnerability

High · published April 9, 2019

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 98.8th percentile for exploit probability.

1633
days past CISA
deadline
CVSS v3.1
7.8
EPSS
45%
Percentile
98.8
In the wild
Confirmed
What it is

🚨 A crafty vulnerability in the Win32k component lets attackers elevate their privileges like a puppet master pulling strings from behind the scenes! ⚡ Think of it like a sneaky guest at a fancy party who finds a way into the VIP lounge without an invitation — once inside, they can do just about anything without being stopped! An attacker could exploit this vulnerability to gain elevated privileges, potentially allowing them to install programs, view or change data, and take complete control of a compromised system. This means sensitive information could be exposed, and malicious actions could go undetected. Yikes!

Put simply

Think of it like a sneaky guest at a fancy party who finds a way into the VIP lounge without an invitation — once inside, they can do just about anything without being stopped! The vulnerability arises when the Win32k component mishandles objects in memory, allowing an attacker to bypass security restrictions and execute arbitrary code with elevated privileges.

What to do

An attacker could exploit this vulnerability to gain elevated privileges, potentially allowing them to install programs, view or change data, and take complete control of a compromised system. This means sensitive information could be exposed, and malicious actions could go undetected. Yikes! To mitigate this threat, update your Windows systems to the latest security patch as soon as possible. Monitor for unusual activities that may indicate exploitation attempts and implement least privilege principles for user accounts. 🔒 You've got this! By following these steps, you can keep your systems secure and maintain your security 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
CVSS v4.0
Not supplied
EPSS
0.45230 · 98.8th percentile
Published
2019-04-09T20:15Z
KEV added
2021-11-03 · due 2022-05-03
EPSS history
Timeline
  • 03 NOV 00:00Z
    Added to CISA KEV — remediate by May 3
    kev
  • 09 APR 20:15Z
    An elevation of privilege vulnerability exists in Windows when the Win32k component fails to properly handle objects in memory, aka 'Win32k Elevation of…
    cvelistv5