Security Digest · Vulnerability record · Known exploited
CVE-2025-6554: Google Chromium V8 Type Confusion Vulnerability
Exploited in the wild (CISA KEV). 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.
CISA KEV · added 2025-07-02 CVSS 8.1 High EPSS 14.1% · p97
Should you act?
Exploited: patch now if you run it
CISA has confirmed exploitation in the wild. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- 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)
CISA’s summary
Google Chromium V8 contains a type confusion vulnerability that could allow a remote attacker to perform arbitrary read/write via a crafted HTML page. This vulnerability could affect multiple web browsers that utilize Chromium, including, but not limited to, Google Chrome, Microsoft Edge, and Opera.
Weakness type: CWE-843.
Product: Google Chromium V8 · Assigned by: Chrome · Published: 2025-06-30
Affected and fixed versions
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| Chrome | 138.0.7204.96 < 138.0.7204.96 |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADP | 3.1 | 8.1 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N |
- Attack vector: network (remotely reachable)
- Attack complexity: low
- Privileges required: none (no login)
- User interaction: required (a user must click/open something)
- Scope: unchanged
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- 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.
Timeline
- — CVE record published by Chrome
- — Added to CISA’s Known Exploited Vulnerabilities catalog
- — CISA remediation deadline for US federal agencies
- — CVE record last updated
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vendor and project advisories, patches
- Listed in CISA KEV notes (chromereleases.googleblog.com) chromereleases.googleblog.com
Vulnerability records
- CVE.org record CVE-2025-6554 cve.org
- NVD entry CVE-2025-6554 nvd.nist.gov
Government
Other references from the CVE record and advisory
- chromereleases.googleblog.com chromereleases.googleblog.com
- issues.chromium.org issues.chromium.org
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