CVE-2025-1920: Google Chrome V8 RCE Vulnerability

CVE-2025-1920 Overview

CVE-2025-1920 is a Type Confusion vulnerability in the V8 JavaScript engine used by Google Chrome. This flaw exists in versions prior to 134.0.6998.88 and allows a remote attacker to potentially exploit heap corruption via a crafted HTML page. The vulnerability has been classified with Chromium security severity as High.

Type confusion vulnerabilities in browser JavaScript engines are particularly dangerous because they can allow attackers to manipulate memory in unexpected ways, potentially leading to arbitrary code execution within the context of the browser process.

Critical Impact

Remote attackers can exploit heap corruption through specially crafted HTML pages, potentially achieving code execution with user privileges on the victim's system.

Affected Products

• Google Chrome versions prior to 134.0.6998.88

Discovery Timeline

• 2025-03-10 - CVE-2025-1920 published to NVD
• 2025-04-07 - Last updated in NVD database

Technical Details for CVE-2025-1920

Vulnerability Analysis

This vulnerability is classified as CWE-843: Access of Resource Using Incompatible Type ('Type Confusion'). Type confusion occurs when a program allocates or initializes a resource such as a pointer, object, or variable using one type, but later accesses that resource using a type that is incompatible with the original type. In V8, the JavaScript engine powering Chrome, this type of vulnerability can lead to heap corruption when the engine incorrectly interprets the type of an object during execution.

The network-based attack vector means exploitation can occur remotely when a user visits a malicious webpage. User interaction (visiting the page) is required for successful exploitation. Once triggered, the vulnerability can compromise confidentiality, integrity, and availability of the affected system.

Root Cause

The root cause lies in V8's type handling mechanism. When V8 processes certain JavaScript code patterns, it may incorrectly infer or cache the type of an object. Subsequent operations then proceed with incorrect type assumptions, leading to memory being accessed or manipulated in ways that violate the expected memory layout. This mismatch between expected and actual types creates the conditions for heap corruption.

Attack Vector

The attack is network-based and requires user interaction. An attacker would craft a malicious HTML page containing JavaScript code designed to trigger the type confusion. When a victim navigates to this page using a vulnerable version of Chrome, the malicious JavaScript executes within the V8 engine, exploiting the type confusion to corrupt heap memory. Successful exploitation could allow the attacker to execute arbitrary code within the browser's sandbox or potentially escape the sandbox depending on other factors.

The attack leverages the browser as the entry point, where specially crafted JavaScript manipulates V8's type system to achieve heap corruption. For technical details on the specific code patterns involved, see the Chromium Issue Tracker Entry.

Detection Methods for CVE-2025-1920

Indicators of Compromise

• Unusual Chrome process crashes or unexpected termination, particularly when visiting unfamiliar websites
• Anomalous memory consumption patterns in Chrome renderer processes
• Browser sandbox escape attempts detected by endpoint protection solutions
• Evidence of exploit kits or malicious JavaScript in web traffic logs

Detection Strategies

• Monitor for Chrome versions below 134.0.6998.88 across the enterprise environment
• Deploy browser-based threat detection that analyzes JavaScript execution patterns
• Utilize network security tools to inspect HTTP/HTTPS traffic for known exploit patterns
• Implement endpoint detection and response (EDR) solutions to identify post-exploitation activity

Monitoring Recommendations

• Configure SIEM rules to alert on Chrome crash reports that may indicate exploitation attempts
• Enable Chrome's built-in crash reporting and monitor for patterns associated with V8 exploitation
• Monitor process behavior for signs of sandbox escape or unusual child process spawning from Chrome
• Track network connections from Chrome processes to identify potential command-and-control communications

How to Mitigate CVE-2025-1920

Immediate Actions Required

• Update Google Chrome to version 134.0.6998.88 or later immediately across all systems
• Enable automatic updates for Chrome to ensure timely patching of future vulnerabilities
• Consider temporary use of alternative browsers if immediate patching is not possible
• Review and restrict access to untrusted websites through web filtering policies

Patch Information

Google has released a security update addressing this vulnerability in Chrome version 134.0.6998.88. The patch was announced in the Google Chrome Stable Update blog post. Organizations should prioritize deployment of this update across all managed Chrome installations.

To verify the installed Chrome version, navigate to chrome://settings/help or check via command line. Chrome's automatic update mechanism should handle updates for most users, but enterprise environments may need to push updates through their software management systems.

Workarounds

• Implement strict content security policies (CSP) on internal web applications to limit JavaScript execution
• Consider using Chrome's Site Isolation feature to provide additional protection against cross-site attacks
• Deploy browser isolation solutions that execute web content in remote containers
• Restrict JavaScript execution on untrusted sites using browser extensions or enterprise policies

# Verify Chrome version on Linux/macOS
google-chrome --version

# Check Chrome version on Windows (PowerShell)
(Get-Item "C:\Program Files\Google\Chrome\Application\chrome.exe").VersionInfo.ProductVersion

# Force Chrome update check via command line (restart required)
# Navigate to chrome://settings/help in browser to trigger update