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🧾 Overview
CVE-2025-6554 is a high-severity zero-day vulnerability discovered in Google Chrome’s V8 JavaScript engine, which is responsible for processing JavaScript in the browser. The flaw is classified as a type confusion vulnerability, and it is already being exploited in the wild at the time of disclosure.
This makes it the fourth actively exploited Chrome zero-day vulnerability in 2025, prompting Google to release an emergency out-of-band patch.
📌 Technical Details
- Vulnerability Type: Type Confusion
- Component: V8 JavaScript engine
- CVE ID: CVE-2025-6554
- Severity Rating: High (CVSS v3.1 score: 8.1)
- Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: Required
- Impact: High Confidentiality + High Integrity + No Availability impact
- Exploit Status: Actively exploited (confirmed zero-day)
- Discovery Date: June 25, 2025
- Reported by: Google Threat Analysis Group (TAG)
🧨 Exploitation in the Wild
- Google confirmed that CVE-2025-6554 is being actively exploited in real-world attacks.
- Likely targets include high-value entities or users susceptible to phishing/social engineering campaigns.
- The exploit involves tricking users into visiting a malicious site that executes crafted JavaScript, triggering the vulnerability in V8.
🖥️ Affected Software
- Google Chrome versions prior to 138.0.7204.96
- Likely affects other Chromium-based browsers (e.g., Microsoft Edge, Brave, Vivaldi) until they adopt the patch.
🛠️ Security Patches and Fix
✅ Fixed Versions:
📅 Patch Release Date:
- Emergency updates began rolling out June 30 – July 1, 2025.
🧪 Detection and Mitigation
- There are currently no public IOCs (Indicators of Compromise) for the exploit.
- Web content inspection or endpoint monitoring tools may detect anomalous JavaScript behavior.
- App sandboxing and least privilege models can help contain browser-based exploits.
