CVE-2025-11152 is a vulnerability identified in Mozilla Firefox's Graphics: Canvas2D component, specifically an integer overflow issue classified under CWE-190. This flaw allows an attacker to escape the browser's sandbox environment, potentially executing arbitrary code with elevated privileges on the host system. The vulnerability affects all Firefox versions prior to 143.0.3. The integer overflow occurs when processing certain Canvas2D operations, which can lead to memory corruption and bypass of security boundaries. The CVSS 3.1 base score is 8.6, reflecting a network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N), unchanged scope (S:U), limited confidentiality impact (C:L), high integrity impact (I:H), and low availability impact (A:L). This means an attacker can exploit the vulnerability remotely without authentication or user interaction, making it highly dangerous. Although no exploits have been reported in the wild yet, the nature of the vulnerability and Firefox's widespread use make it a significant threat. The vulnerability's exploitation could lead to unauthorized code execution, data manipulation, and partial service disruption, undermining system security and user trust.

For European organizations, this vulnerability poses a substantial risk due to Firefox's popularity as a web browser across both public and private sectors. Exploitation could lead to unauthorized access to sensitive information, compromise of system integrity through code execution, and potential disruption of services relying on Firefox-based applications. Sectors such as finance, government, healthcare, and critical infrastructure are particularly vulnerable, as attackers could leverage this flaw to gain footholds within secure environments. The ability to escape the sandbox without user interaction increases the risk of automated or remote exploitation campaigns. Additionally, the partial availability impact could affect operational continuity. Given the interconnected nature of European networks and regulatory requirements like GDPR, a breach stemming from this vulnerability could result in significant legal and reputational consequences.

The primary mitigation is to update Mozilla Firefox to version 143.0.3 or later, where the vulnerability has been patched. Organizations should enforce rapid patch management policies to ensure all endpoints are updated promptly. In environments where immediate patching is not feasible, consider disabling or restricting Canvas2D features via browser configuration or group policies to reduce attack surface. Employ endpoint detection and response (EDR) solutions capable of monitoring unusual process behaviors related to graphics rendering or sandbox escapes. Network-level protections such as web filtering and intrusion prevention systems (IPS) should be tuned to detect and block exploit attempts targeting this vulnerability. Additionally, educate users about the risks of visiting untrusted websites that could host malicious content exploiting this flaw. Regular security audits and vulnerability scanning should include checks for outdated Firefox versions.