CVE-2025-3620: Google Chrome Use After Free Vulnerability

CVE-2025-3620 Overview

Use after free in USB in Google Chrome prior to 135.0.7049.95 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page. (Chromium security severity: High)

Critical Impact

This vulnerability could allow remote code execution, leading to potential system takeover by an attacker.

Affected Products

• Google Chrome 134.x and earlier

Discovery Timeline

• Not Available - Vulnerability discovered by Not Available
• Not Available - Responsible disclosure to Google
• Not Available - CVE CVE-2025-3620 assigned
• Not Available - Google releases security patch
• 2025-04-16 - CVE CVE-2025-3620 published to NVD
• 2025-04-23 - Last updated in NVD database

Technical Details for CVE-2025-3620

Vulnerability Analysis

The issue is a use-after-free vulnerability in the USB component. It arises when handling USB device methods due to insufficient memory management, potentially leading to execution of arbitrary code.

Root Cause

Improper handling of memory allocations in the USB device handling code, leading to use after free.

Attack Vector

Network-based. An attacker can exploit this vulnerability by persuading users to load an HTML page with specially crafted content.

// Example exploitation code (sanitized)
void exploitExample() {
    USBDevice *device = getUSBDevice();
    releaseDevice(device);
    useDevice(device); // Use after free vulnerability
}

Detection Methods for CVE-2025-3620

Indicators of Compromise

• Unusual memory access patterns
• Execution of arbitrary code with user-level privileges
• Crashes or system instability

Detection Strategies

Monitor browser processes for suspicious behavior, particularly memory access violations.
Analyze network traffic for attempts to load malicious HTML pages.

Monitoring Recommendations

Employ EDR solutions, such as SentinelOne, to actively scan for anomalous activity within Chrome processes. Utilize threat intelligence feeds to identify suspicious URLs associated with exploitation attempts.

How to Mitigate CVE-2025-3620

Immediate Actions Required

• Update Google Chrome to version 135.0.7049.95 or later
• Educate users on the dangers of visiting untrusted sites
• Enable automatic updates for Chrome

Patch Information

Refer to the vendor advisory for patches: Vendor Advisory.

Workarounds

Consider using browser hardening settings to restrict access to USB devices and further mitigate potential exploitation.

# Configuration example
chrome --disable-usb