CVE-2025-6554
Google Chromium V8 Type Confusion Vulnerability
Google Chromium V8
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. (Chromium security severity: High)
Exploitation status
CISA Known Exploited Vulnerabilities
Listed by CISA on 2 July 2025. US federal agencies were required to remediate it by 23 July 2025.
EPSS — exploitation probability
FIRST puts the probability of exploitation activity in the next 30 days at 14.1%, which is higher than 96.6% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Frequently asked questions
Is CVE-2025-6554 being exploited by ransomware groups?
No ransomware group in this database is currently recorded as exploiting CVE-2025-6554.
What does CVE-2025-6554 affect?
CVE-2025-6554 affects Google Chromium V8. 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. (Chromium security severity: High)
How severe is CVE-2025-6554?
CVE-2025-6554 is rated HIGH with a CVSS base score of 8.1. EPSS puts the probability of exploitation in the next 30 days at 14.1%, higher than 96.6% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 23 July 2025.
How should organisations respond to CVE-2025-6554?
Apply the vendor patch for Google Chromium V8 as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.