CVE-2025-5280: Google Chrome V8 RCE Vulnerability

CVE-2025-5280 Overview

CVE-2025-5280 is an out-of-bounds write vulnerability in the V8 JavaScript engine used by Google Chrome. This memory corruption flaw affects Chrome versions prior to 137.0.7151.55 and could allow a remote attacker to potentially exploit heap corruption through a specially crafted HTML page. The vulnerability was classified as high severity by the Chromium security team.

Critical Impact

This out-of-bounds write in Chrome's V8 engine could enable remote attackers to corrupt heap memory and potentially achieve arbitrary code execution by luring users to malicious web pages.

Affected Products

• Google Chrome versions prior to 137.0.7151.55
• Chromium-based browsers using vulnerable V8 versions
• All platforms running affected Chrome versions (Windows, macOS, Linux)

Discovery Timeline

• 2025-05-27 - CVE-2025-5280 published to NVD
• 2025-05-29 - Last updated in NVD database

Technical Details for CVE-2025-5280

Vulnerability Analysis

This vulnerability represents an out-of-bounds write condition (CWE-787) within Chrome's V8 JavaScript engine—the component responsible for parsing and executing JavaScript code. Out-of-bounds write vulnerabilities occur when a program writes data beyond the boundaries of allocated memory buffers, potentially corrupting adjacent heap structures.

In the context of V8, such vulnerabilities are particularly dangerous because attackers can craft malicious JavaScript that triggers the out-of-bounds write during JIT (Just-In-Time) compilation or garbage collection operations. Successful exploitation could allow an attacker to overwrite critical heap metadata or function pointers, potentially leading to arbitrary code execution within the browser's renderer process.

The attack requires user interaction—specifically, a victim must navigate to a malicious web page containing the crafted HTML and JavaScript payload. However, this interaction requirement is easily satisfied through phishing campaigns or compromised advertisements on legitimate websites.

Root Cause

The vulnerability stems from improper bounds checking within V8's memory management routines. When processing certain JavaScript constructs, V8 fails to properly validate array indices or buffer sizes before performing write operations, allowing attackers to write data outside allocated heap regions. This type of flaw typically occurs during optimization passes in the JIT compiler where assumptions about array bounds may be incorrectly propagated.

Attack Vector

Exploitation of CVE-2025-5280 follows a network-based attack vector requiring user interaction:

1. An attacker crafts a malicious HTML page containing JavaScript code designed to trigger the out-of-bounds write condition in V8
2. The victim is lured to visit the malicious page through phishing, malvertising, or compromised website content
3. Upon loading the page, the malicious JavaScript executes within Chrome's renderer process
4. The crafted code triggers the memory corruption, potentially allowing heap spraying techniques to achieve code execution
5. If successful, the attacker could execute arbitrary code within the sandboxed renderer context, potentially chaining with additional vulnerabilities for sandbox escape

Technical details regarding the specific triggering conditions can be found in the Chromium Issue Report #417169470.

Detection Methods for CVE-2025-5280

Indicators of Compromise

• Unusual browser crashes or hangs when visiting specific web pages
• Chrome renderer process crashes with heap corruption signatures in crash dumps
• Detection of known malicious JavaScript patterns associated with V8 exploitation
• Network traffic to domains known to host Chrome exploit kits

Detection Strategies

• Monitor endpoint telemetry for Chrome renderer process crashes with heap-related exception codes
• Deploy browser extension policies that log JavaScript execution anomalies
• Utilize web proxy or network security tools to inspect and block known exploit delivery domains
• Implement memory protection monitoring for Chrome processes to detect heap corruption attempts

Monitoring Recommendations

• Enable Chrome crash reporting and analyze crash signatures for V8-related heap corruption patterns
• Configure SIEM rules to correlate browser crash events with suspicious URL access patterns
• Monitor for Chrome versions below 137.0.7151.55 across the enterprise environment
• Track Chrome update deployment status to ensure timely patching across all endpoints

How to Mitigate CVE-2025-5280

Immediate Actions Required

• Update Google Chrome to version 137.0.7151.55 or later immediately across all systems
• Enable automatic Chrome updates to ensure prompt deployment of security patches
• Educate users about the risks of visiting untrusted websites and clicking suspicious links
• Consider restricting JavaScript execution on untrusted sites using browser policies or extensions

Patch Information

Google has addressed this vulnerability in Chrome version 137.0.7151.55, released on May 27, 2025. Organizations should prioritize deploying this update across all managed endpoints. Details about the stable channel update are available in the Google Chrome Desktop Update announcement.

For enterprise environments, administrators can use Chrome Browser Cloud Management or group policies to enforce minimum version requirements and automate update deployment.

Workarounds

• Enable Site Isolation in Chrome to contain potential exploitation to the renderer process
• Consider using browser isolation solutions for high-risk users or when visiting untrusted content
• Disable JavaScript for untrusted sites using Chrome's site settings or extensions like NoScript
• Deploy network-level protections to block access to known exploit delivery infrastructure

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

# Force Chrome update check via command line (Windows)
# Navigate to chrome://settings/help to trigger update

# Enterprise: Set minimum Chrome version via policy
# Windows Registry example
reg add "HKLM\SOFTWARE\Policies\Google\Chrome" /v "MinimumChromeVersion" /t REG_SZ /d "137.0.7151.55" /f