CVE-2025-6554KEV · OVERDUECWE-843

Google Chromium V8 Type Confusion Vulnerability

High · published June 30, 2025

Patch now

Confirmed exploited, and the score agrees

CVSS calls it high at 8.1. It is confirmed in active exploitation. It sits in the 96.6th percentile for exploit probability.

457
days past CISA
deadline
CVSS v3.1
8.1
EPSS
14%
Percentile
96.6
In the wild
Confirmed
What it is

🚨 A crafty HTML page can lead to complete chaos! A remote attacker could manipulate the V8 engine in Google Chrome to read or write arbitrary data — that's like letting a mischievous guest rearrange your living room while you’re not looking! ⚡ Think of V8 like a fancy restaurant's kitchen. If the chef (the engine) misinterprets an order due to confusion, it could serve up a dish that wasn’t on the menu—potentially harmful to diners. This confusion is what attackers exploit to sneak in their concoctions! An attacker exploiting this vulnerability could access sensitive information or alter critical data within your browser, potentially leading to severe privacy breaches or even total system compromise. The implications are absolutely devastating and could unravel your online safety!

Put simply

Think of V8 like a fancy restaurant's kitchen. If the chef (the engine) misinterprets an order due to confusion, it could serve up a dish that wasn’t on the menu—potentially harmful to diners. This confusion is what attackers exploit to sneak in their concoctions! This type confusion vulnerability in the V8 engine allows attackers to manipulate the way data types are interpreted, causing the JavaScript engine to execute unintended operations and compromise security mechanisms.

What to do

An attacker exploiting this vulnerability could access sensitive information or alter critical data within your browser, potentially leading to severe privacy breaches or even total system compromise. The implications are absolutely devastating and could unravel your online safety! Update Google Chrome to version 138.0.7204.96 or later immediately. Encourage users to enable automatic updates and monitor for suspicious activity on their devices to ensure safety. Don’t forget to check your extensions too! You've got this! Secure your browsing experience, and you'll be back to surfing safely in no time! 🛡️

The record
Technical detail
CVSS v3.1
8.1 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.14142 · 96.6th percentile
Weakness
CWE-843 · Access of Resource Using Incompatible Type ('Type Confusion')
Published
2025-06-30T21:14Z
KEV added
2025-07-02 · due 2025-07-23
EPSS history
Timeline
  • 02 JUL 00:00Z
    Added to CISA KEV — remediate by Jul 23
    kev
  • 30 JUN 21:14Z
    Type confusion in V8 in Google Chrome prior to 138.0.7204.96 allowed a remote attacker to perform arbitrary read/write via a crafted HTML page
    cvelistv5