CVE-2025-20805 is a use-after-free vulnerability classified under CWE-416, affecting MediaTek chipsets MT6899, MT6991, and MT8793. The flaw resides in the dpe component, where improper handling of memory leads to use-after-free conditions, resulting in potential memory corruption. This corruption can be exploited to escalate privileges locally, but only if the attacker has already obtained System-level privileges on the device. The vulnerability does not require any user interaction to be exploited, increasing the risk in environments where an attacker has system access. The CVSS v3.1 score of 6.7 reflects a medium severity with a vector indicating local attack vector (AV:L), low attack complexity (AC:L), high privileges required (PR:H), no user interaction (UI:N), unchanged scope (S:U), and high impact on confidentiality, integrity, and availability (C:H/I:H/A:H). Although no public exploits are known at this time, the vulnerability poses a significant risk for privilege escalation on affected devices. The issue was reserved in November 2024 and published in January 2026. MediaTek has identified a patch (ALPS10114696) to address this vulnerability, though no direct patch links are provided. The vulnerability primarily affects devices using the specified MediaTek chipsets, which are common in many smartphones and IoT devices. Due to the requirement for existing system privileges, the threat is more relevant in scenarios where attackers have already compromised the device or have insider access.

The primary impact of CVE-2025-20805 is local privilege escalation, allowing attackers with existing System privileges to gain even higher or more persistent control over the affected device. This can lead to full compromise of device confidentiality, integrity, and availability. Attackers could manipulate sensitive data, install persistent malware, or disrupt device functionality. Since the vulnerability requires prior system-level access, it is unlikely to be exploited remotely by external attackers without initial compromise. However, in environments where devices are shared, or where insider threats exist, this vulnerability significantly increases the risk of privilege abuse. The affected chipsets are widely used in smartphones and IoT devices, meaning a broad range of consumer and enterprise devices could be impacted. This could affect mobile communications, embedded systems, and critical infrastructure relying on MediaTek hardware. The lack of user interaction requirement makes automated exploitation feasible once system access is obtained, increasing the potential damage in compromised environments.

1. Apply the official patch (ALPS10114696) from MediaTek as soon as it becomes available to eliminate the use-after-free condition. 2. Implement strict access controls and privilege separation to minimize the number of users or processes with System-level privileges on devices using affected chipsets. 3. Employ runtime memory protection techniques such as Address Space Layout Randomization (ASLR) and Control Flow Integrity (CFI) where supported to reduce exploitation success. 4. Monitor devices for unusual privilege escalation attempts or anomalous behavior indicative of exploitation. 5. Use endpoint detection and response (EDR) tools tailored for mobile and embedded devices to detect post-compromise activities. 6. Limit physical and network access to devices to reduce the risk of initial system-level compromise. 7. Educate users and administrators about the risks of privilege escalation and the importance of timely patching. 8. For device manufacturers and integrators, conduct thorough security testing on MediaTek chipset-based products to identify and remediate similar vulnerabilities proactively.