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Security Advisory

Google Chrome Patches Actively Exploited Zero-Day Vulnerability 

Summary : Security Advisory

Google has released a critical out-of-band security update for its Chrome browser to address CVE-2025-5419.

Rated as high-severity zero-day vulnerability in the V8 JavaScript engine that is currently being actively exploited in the wild.

OEM Google 
Severity HIGH 
CVSS Score 8.8 
CVEs CVE-2025-5419 
Actively Exploited Yes 
Exploited in Wild Yes 
Advisory Version 1.0 

Overview 

This vulnerability allows attackers to execute arbitrary code on users’ systems through specially crafted web content, making it a serious threat requiring immediate attention. 

In addition to the zero-day fix, this update also includes a patch for CVE-2025-5068, a medium severity use-after-free vulnerability in Blink, chrome’s rendering engine.

While less critical, such flaws can still result in memory corruption and possible code execution. 

Vulnerability Name CVE ID Product Affected Severity Fixed Version 
​Out-of-bounds memory access vulnerability  CVE-2025-5419 Google Chrome  High  137.0.7151.68/.69 (Win/Mac), 137.0.7151.68 (Linux) 

Technical Summary 

This high-severity vulnerability is caused by an out-of-bounds read and write weakness in Chrome’s V8 JavaScript engine, reported one week ago by Clement Lecigne and Benoît Sevens of Google’s Threat Analysis Group.

This flaw affects the V8 JavaScript engine and allows attackers to execute arbitrary code via crafted web content.

CVE ID System Affected Vulnerability Details Impact 
  CVE-2025-5419  Chrome (all platforms) Out-of-bounds read and write in the V8 JavaScript engine; triggered via malicious HTML   Arbitrary code execution, memory compromise, remote attack 

Remediation: 

Apply Patches Promptly: Upgrade to Chrome version 137.0.7151.68/.69 or later for Windows and macOS, and 137.0.7151.68 or later for Linux to mitigate the vulnerabilities. 

General Recommendation: 

  • Prioritize Zero-Day Fixes: Treat this patch as high priority due to confirmed in-the-wild exploitation. Immediate action is critical to prevent potential system compromise. 
  • Update Chromium-Based Browsers: Ensure Chromium-based browsers like Microsoft Edge, Brave, Opera, and Vivaldi are updated as soon as vendor-specific patches are released. 
  • Automate Browser Updates: Enable automatic updates in Chrome and Chromium environments to maintain timely patching against emerging threats. 
  • Enterprise Patch Rollout: Administrators should fast-track deployment of the fixed version across all endpoints, particularly in high-risk or externally exposed environments. 
  • Monitor for Threat Activity: Continuously monitor browser and network activity for signs of exploitation attempts targeting vulnerable versions. 

Conclusion: 
CVE-2025-5419 poses a significant security risk with confirmed active exploitation in the wild.

Google’s swift action highlights the urgency of this threat. All users are strongly advised to update their Chrome browsers immediately. Delaying this update could expose systems to compromise through malicious web content exploiting this zero-day vulnerability. 

While Chrome will automatically update when new security patches are available, users can speed up the process by going to the Chrome menu > Help > About Google Chrome, letting the update finish, and clicking the ‘Relaunch’ button to install it immediately.

References: 

Security Advisory

Zero-Day Threat in Chrome’s Loader Component (CVE-2025-4664) – CISA Flags Urgent Risk 

Summary : A zero-day vulnerability (CVE-2025-4664) in Google Chrome’s Loader component has been actively exploited in the wild.

OEM Google 
Severity Medium 
CVSS Score 4.3 
CVEs CVE-2025-4664 
Actively Exploited Yes 
Exploited in Wild Yes 
Advisory Version 1.0 

Overview 

This flaw allows attackers to bypass security policies, leak cross-origin data, and potentially execute unauthorized code. CISA has added this vulnerability to its Known Exploited Vulnerabilities (KEV) catalog, urging immediate patching. 

Vulnerability Name CVE ID Product Affected Severity Fixed Version 
​Insufficient Policy Enforcement vulnerability  CVE-2025-4664 Google Chrome  Medium  136.0.7103.113/.114 (Win/Mac),  136.0.7103.113 (Linux) 

Technical Summary 

CVE-2025-4664 is a zero-day vulnerability found in the Chrome Loader component due to insufficient policy enforcement.

It enables remote attackers to bypass browser security controls using crafted HTML content, possibly leaking cross-origin data or achieving sandbox escape. The bug has been actively exploited in the wild.

A second high-severity flaw, CVE-2025-4609, was also addressed in this update, involving an incorrect handle in the Mojo IPC layer, which can lead to memory corruption or privilege escalation. 

CVE ID System Affected Vulnerability Details Impact 
  CVE-2025-4664  Chrome (Windows, Mac, Linux) Insufficient policy enforcement in Loader enables cross-origin data leaks via crafted HTML.  Data leakage, sandbox escape, potential code execution 

Remediation: 

  • Update Chrome: Google has released security updates to address these vulnerabilities. Users and administrators must apply the latest Chrome versions: 
  • Windows/macOS: Chrome 136.0.7103.113 /136.0.7103.114 or later 
  • Linux: Chrome 136.0.7103.113 or later 

Conclusion: 
The active exploitation of CVE-2025-4664 highlights the urgent need for rapid security response and patch management. With acknowledgment from CISA and public disclosure by @slonser_, this zero-day poses a real and present threat to users of Chrome and other Chromium-based browsers.

Organizations should take immediate action to patch affected systems and monitor for signs of compromise.

Regular browser updates and proactive vulnerability management are essential to mitigating such critical security risks. 

References: 

Security Advisory

Critical Chrome Vulnerability (CVE-2025-2783) Exploited in Cyber-Espionage Campaign

OEMGoogle Chrome
SeverityHigh
CVSS8.3
CVEsCVE-2025-2783
Exploited in WildYes
Patch/Remediation AvailableYes
Advisory Version1.0

Overview

The Cybersecurity and Infrastructure Security Agency (CISA) has issued an urgent advisory regarding the critical zero-day vulnerability, CVE-2025-2783, in Google Chrome and other Chromium-based browsers on Windows. This vulnerability is actively exploited in the wild and has been added to CISA’s Known Exploited Vulnerabilities (KEV) catalog, urged immediate patching to prevent security breaches and unauthorized system access.

Vulnerability NameCVE IDProduct AffectedSeverityFixed Version
  Google Chromium Mojo Sandbox Escape Vulnerability  CVE-2025-2783  Google Chrome  High  134.0.6998.117/.118

Technical Summary

This high-severity vulnerability found in the Mojo framework of Chromium-based browsers including Google Chrome, Microsoft Edge, and Opera, Brave etc. The vulnerability originates from a logic error that results in an incorrect handle being provided under certain conditions. This flaw allows attackers to bypass Chrome’s sandbox protections and potentially execute arbitrary code on the affected system.

Security researchers from Kaspersky discovered this zero-day vulnerability as part of an advanced cyber-espionage campaign dubbed “Operation ForumTroll.” The attack campaign targeted media outlets, educational institutions, and government organizations in Russia through highly personalized phishing emails.

The exploit chain is particularly dangerous because it requires minimal user interaction. Victims only need to click on a malicious link in a phishing email, after which the attack executes automatically without any additional action from the user. Once triggered, the exploit allows attackers to escape Chrome’s sandbox environment, leading to remote code execution and possible system compromise.

CVE IDSystem AffectedVulnerability DetailsImpact
    CVE-2025-2783    Google Chrome (Windows)    Incorrect handle provided in Mojo, allowing sandbox escape  Remote code execution, System Compromise

Remediation:

  • Google Chrome Patch Released: Google has released security updates in Chrome versions 134.0.6998.177/.178 to address this vulnerability. Users should update immediately.

General Recommendations:

  • Enable Automatic Updates: Ensure automatic updates are enabled in Google Chrome and other Chromium-based browsers to receive future security patches promptly.
  • Phishing Awareness Training: Organizations should educate employees on identifying and avoiding phishing emails to prevent exploitation.
  • Endpoint Security Measures: Deploy endpoint detection and response (EDR) solutions to monitor and mitigate potential threats.
  • CISA Compliance for Federal Agencies: Federal agencies must adhere to CISA’s Binding Operational Directive (BOD) 22-01 to address known exploited vulnerabilities promptly.

Conclusion:

The exploitation of CVE-2025-2783 demonstrates the ongoing threat posed by sophisticated cyber-espionage activities.  Google has responded swiftly with a patch, and users are strongly advised to update their browsers immediately. Organizations should remain vigilant against phishing attempts and enhance their cybersecurity posture to mitigate similar threats in the future.

References:

News Security Advisory

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