CVE-2025-20807 is a medium-severity integer overflow vulnerability (CWE-190) found in the dpe component of MediaTek chipsets MT6899, MT6991, and MT8793. The vulnerability arises from improper handling of integer values, which leads to an out-of-bounds write condition. This memory corruption flaw can be exploited locally by an attacker who already possesses System-level privileges to escalate their privileges further, potentially gaining higher control over the device. The vulnerability does not require user interaction, increasing the risk of automated or stealthy exploitation once initial access is obtained. The CVSS v3.1 base score is 6.7, reflecting the need for high privileges to exploit but the significant impact on confidentiality, integrity, and availability if exploited. The flaw is particularly critical in environments where these chipsets are embedded in mobile devices, IoT devices, or other consumer electronics, as it could allow attackers to bypass security controls and execute arbitrary code or disrupt system operations. Although no public exploits are known at this time, the presence of a patch (ALPS10114841) indicates that MediaTek has addressed the issue. The vulnerability was reserved in November 2024 and published in January 2026, suggesting a recent discovery and disclosure timeline.

The primary impact of CVE-2025-20807 is local privilege escalation on devices using the affected MediaTek chipsets. An attacker with System-level privileges could exploit this vulnerability to gain higher privileges, potentially leading to full device compromise. This could allow unauthorized access to sensitive data, modification or deletion of critical system files, and disruption of device functionality. The vulnerability affects confidentiality, integrity, and availability, making it a significant risk in environments where these chipsets are deployed. Given the widespread use of MediaTek chipsets in smartphones, tablets, and IoT devices globally, exploitation could lead to large-scale security breaches, especially in consumer and enterprise environments relying on these devices for secure communications and operations. The lack of user interaction requirement facilitates stealthy exploitation post-initial compromise, increasing the threat to organizations. However, the requirement for existing System privileges limits the initial attack surface, making it less likely to be exploited by remote attackers without prior access.

To mitigate CVE-2025-20807, organizations should prioritize applying the official patch ALPS10114841 provided by MediaTek as soon as it becomes available. Until patched, strict access controls should be enforced to limit System-level privileges to trusted users and processes only. Employing robust endpoint protection and monitoring for unusual privilege escalation attempts can help detect exploitation attempts early. Device manufacturers and integrators should ensure secure boot and runtime integrity checks to prevent unauthorized code execution. Network segmentation and least privilege principles should be applied to reduce the risk of initial compromise leading to exploitation. Additionally, organizations should maintain up-to-date inventories of devices using affected chipsets to assess exposure and prioritize remediation. Security teams should also monitor threat intelligence feeds for any emerging exploits targeting this vulnerability to respond promptly.