CVE-2025-6558 Vulnerability: Google Chrome Zero-Day Under Active Exploitation
As the summer heat continues to climb, so does the surge of critical vulnerabilities in popular software products, intensifying the global cyber threat landscape. Hot on the heels of the disclosure of CVE-2025-25257, a critical flaw in Fortinet’s FortiWeb web application firewall, another high-impact vulnerability has emerged. Adversaries are exploiting a critical zero-day vulnerability in Google Chrome browser tracked as CVE-2025-6558, driving the urgent rollout of patches across all supported systems.
Zero-day exploitation has been steadily increasing over the past four years, showing a gradual upward trend despite yearly fluctuations. In 2024, Google’s Threat Intelligence Group reported 75 actively exploited zero-day vulnerabilities, reinforcing this consistent growth pattern in real-world exploitation activity. As of 2025, exploits continue to dominate as the primary method of initial access, responsible for 33% of intrusion vectors.
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CVE-2025-6558 Analysis
Google has recently released patches for six security vulnerabilities in its Chrome web browser, one of which has been confirmed as actively weaponized in in-the-wild attacks. CVE-2025-6558 enables remote threat actors to escape the browser sandbox by leveraging a specially crafted HTML page. The flaw originates from improper handling and validation of untrusted input within the ANGLE and GPU components.
ANGLE serves as an intermediary between Chrome’s rendering engine and the system’s graphics drivers. Flaws in this component can be exploited to bypass Chrome’s sandbox protections by manipulating low-level GPU functions typically kept isolated, presenting a rare but serious vector for deeper system compromise. For most users, this kind of sandbox escape means that simply visiting a malicious webpage could give adversaries the green light to breach the browser’s security and interact with the host system—no downloads or user interaction required. This is particularly concerning in the context of targeted attacks. While Google hasn’t revealed technical specifics of the exploit, it confirmed that CVE-2025-6558 is being actively weaponized, with its Threat Analysis Group suggesting potential nation-state involvement.
As potential CVE-2025-6558 mitigation measures, users are strongly encouraged to update Chrome to version 138.0.7204.157/.158 on Windows and macOS, or 138.0.7204.157 on Linux. Users of Chromium-based browsers, such as Microsoft Edge, Brave, Opera, and Vivaldi, should also apply relevant updates as they become available.
Defending against zero-day vulnerability exploitation remains a strategic challenge for defenders. As exploits become more accessible, attackers experiment with innovative technologies, pressuring vendors with limited experience. While zero-trust basics, such as least-privilege and segmentation, are vital, true resilience depends on vendors’ and organizations’ ability to quickly counter evolving threats. By leveraging SOC Prime’s complete product suite, backed by AI, threat hunting automation, AI-native threat intelligence, and advanced detection engineering, and built on the zero-trust principles, global organizations can adopt a resilient cybersecurity posture and transform their SOC.
