CVE-2025-20800 is a vulnerability classified under CWE-787 (Out-of-bounds Write) found in several MediaTek chipsets (MT2718, MT6899, MT6989, MT6991, MT8678, MT8793) that power Android devices running versions 14.0 through 16.0. The vulnerability arises from a missing bounds check in the mminfra component, which is part of the MediaTek infrastructure likely responsible for memory management or multimedia processing. This flaw allows a local attacker who already has System privileges to perform an out-of-bounds write, potentially overwriting critical memory regions. Such memory corruption can lead to escalation of privileges beyond the System level, enabling the attacker to gain higher control over the device, compromise sensitive data, or disrupt system operations. Exploitation does not require user interaction, increasing the risk if an attacker gains initial System access, which might be obtained through other vulnerabilities or insider threats. The CVSS v3.1 score is 7.8, reflecting high impact on confidentiality, integrity, and availability, with low attack complexity and low privileges required but limited to local access. No public exploits are currently known, but the vulnerability is serious enough to warrant immediate attention. A patch has been identified (ALPS10267349), though no direct patch links are provided. The vulnerability affects a broad range of MediaTek chipsets used in many Android devices, making it relevant for mobile device security and embedded systems relying on these chipsets.

For European organizations, this vulnerability poses a significant risk especially for those relying on mobile devices or embedded systems powered by affected MediaTek chipsets. Successful exploitation can lead to full system compromise, allowing attackers to bypass security controls, access sensitive corporate data, or disrupt critical services. The local nature of the attack means that threat actors with some level of access (e.g., through insider threats, compromised apps, or chained exploits) can escalate privileges to gain persistent and deeper control. This can impact confidentiality by exposing sensitive information, integrity by allowing unauthorized modifications, and availability by potentially causing system crashes or denial of service. Industries with high mobile device usage or IoT deployments, such as finance, healthcare, and manufacturing, are particularly vulnerable. The lack of user interaction requirement increases the risk of automated or stealthy attacks once initial access is gained. Without timely patching, organizations face increased exposure to advanced persistent threats and targeted attacks.

1. Apply the official MediaTek patch ALPS10267349 as soon as it becomes available from device manufacturers or vendors to remediate the out-of-bounds write issue. 2. Restrict and monitor System-level privileges on devices to minimize the risk of initial compromise that could lead to privilege escalation. 3. Employ mobile device management (MDM) solutions to enforce security policies, control app installations, and detect anomalous behavior indicative of exploitation attempts. 4. Conduct regular security audits and vulnerability assessments on devices using affected chipsets to identify potential compromise early. 5. Educate users and administrators about the risks of privilege escalation and the importance of applying updates promptly. 6. Implement network segmentation and least privilege principles to limit lateral movement if a device is compromised. 7. Monitor security advisories from MediaTek and Android OEMs for updates or additional mitigations. 8. Consider deploying endpoint detection and response (EDR) tools capable of detecting suspicious local privilege escalation activities on mobile and embedded devices.