CVE-2025-13639 is a vulnerability identified in the WebRTC component of Google Chrome versions prior to 143.0.7499.41. WebRTC (Web Real-Time Communication) enables peer-to-peer communication capabilities directly in browsers, including audio, video, and data sharing. The vulnerability arises from an inappropriate implementation that allows a remote attacker to execute arbitrary read and write operations on the victim's browser context by delivering a specially crafted HTML page. This is classified under CWE-79, indicating a cross-site scripting (XSS) related flaw, which can lead to unauthorized access to sensitive data or manipulation of browser state. The attack vector is remote network (AV:N), requires no privileges (PR:N), but does require user interaction (UI:R), such as clicking a link or visiting a malicious website. The scope is unchanged (S:U), meaning the impact is confined to the vulnerable component without affecting other system components. The CVSS v3.1 base score is 8.1, reflecting high severity due to high confidentiality and integrity impacts, though availability is not affected. No known exploits have been reported in the wild yet, but the potential for exploitation exists given the ease of triggering the vulnerability via crafted web content. The lack of a patch link in the provided data suggests that users should update to the fixed Chrome version 143.0.7499.41 or later once available. This vulnerability poses a risk of data leakage, session hijacking, or unauthorized manipulation of browser data, which can be leveraged for further attacks or espionage.

For European organizations, this vulnerability poses a significant risk to the confidentiality and integrity of sensitive information accessed via Google Chrome. Since Chrome is widely used across enterprises and government agencies in Europe, exploitation could lead to unauthorized data access, session hijacking, or manipulation of web application data. This could compromise corporate secrets, personal data protected under GDPR, and critical communications. The requirement for user interaction means phishing or social engineering campaigns could be used to trigger the exploit, increasing the risk to employees and users. The vulnerability does not affect availability, so service disruption is unlikely, but the stealthy nature of read/write exploits can facilitate persistent espionage or data exfiltration. Organizations involved in finance, healthcare, and critical infrastructure are particularly at risk due to the sensitivity of their data and the strategic importance of maintaining confidentiality and integrity.

1. Immediately update all Google Chrome installations to version 143.0.7499.41 or later, as this version contains the fix for CVE-2025-13639. 2. Implement strict Content Security Policies (CSP) on internal web applications to reduce the risk of malicious script execution. 3. Educate users about the risks of clicking unknown or suspicious links, especially those received via email or messaging platforms. 4. Employ browser security extensions or endpoint protection solutions that can detect and block malicious web content or scripts. 5. Monitor network traffic for unusual outbound connections or data exfiltration attempts that could indicate exploitation. 6. Conduct regular security audits and penetration testing focused on web browser security and WebRTC usage. 7. For organizations with high security requirements, consider restricting WebRTC usage via browser policies or extensions until the patch is applied. 8. Maintain an inventory of browser versions in use across the organization to ensure timely updates and compliance.