---
title: "CVE-2025-6554: Google Chromium V8 Type Confusion Vulnerability"
url: https://erroneo.us/security/cve/CVE-2025-6554/
description: "CVE-2025-6554 (Google Chromium V8): Exploited in the wild (CISA KEV). Type confusion in V8 in Google Chrome prior to 138.0.7204.96 allowed a remote attacker…"
type: vulnerability-record
section: "Security Digest"
date_published: 2025-06-30
date_modified: 2025-10-21
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2025-6554"
kev: true
cvss: 8.1
epss: 0.14142
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2025-6554: Google Chromium V8 Type Confusion Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Google Chromium V8. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2025-07-02, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2025-07-23 ; treat that as the outer limit, not the target.
- EPSS 14.1% , percentile 97: FIRST’s model estimates a 14.1% chance of exploitation activity in the next 30 days, higher than 97% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Needs a user to click or open something. Phishing makes that realistic, but it is not wormable.

## What it is

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)

## Affected products (CVE record)

- Google Chrome: 138.0.7204.96 < 138.0.7204.96

## Severity

- CISA-ADP CVSS 3.1: 8.1 `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N`

## Exploitation

- CISA KEV: added 2025-07-02; federal due date 2025-07-23. Known ransomware use: Unknown.
- CISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- CISA SSVC assessment: exploitation active , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 14.14% probability of exploitation activity in the next 30 days; percentile 97.

## Sources

- [Listed in CISA KEV notes (chromereleases.googleblog.com)](https://chromereleases.googleblog.com/2025/06/stable-channel-update-for-desktop_30.html?m=1)
- [CVE.org record CVE-2025-6554](https://www.cve.org/CVERecord?id=CVE-2025-6554)
- [NVD entry CVE-2025-6554](https://nvd.nist.gov/vuln/detail/CVE-2025-6554)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-6554)
- [chromereleases.googleblog.com](https://chromereleases.googleblog.com/2025/06/stable-channel-update-for-desktop_30.html)
- [issues.chromium.org](https://issues.chromium.org/issues/427663123)

---
Source page: https://erroneo.us/security/cve/CVE-2025-6554/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt