CVE-2025-20799 is a use-after-free vulnerability classified under CWE-416 found in the c2ps component of MediaTek chipsets MT6899, MT6991, MT6993, and MT8793, which are integrated into devices running Android versions 15.0 and 16.0. The vulnerability arises from improper memory management where a previously freed memory region is accessed, leading to memory corruption. This flaw can be exploited locally by an attacker who has already obtained System privileges on the device to escalate their privileges further, potentially gaining higher-level control or executing arbitrary code with elevated rights. Notably, exploitation does not require any user interaction, increasing the risk of automated or stealthy attacks. Although no public exploits have been reported so far, the vulnerability is significant because it can be leveraged in post-compromise scenarios to deepen an attacker’s foothold. The issue was identified and assigned by MediaTek, with a patch referenced as ALPS10274607, though no direct patch links are currently provided. The vulnerability affects a wide range of devices using these chipsets, which are prevalent in many Android smartphones globally. The absence of a CVSS score necessitates an independent severity assessment based on the impact and exploitability factors.

For European organizations, the primary impact of CVE-2025-20799 lies in the potential for attackers who have already compromised a device at the System privilege level to escalate their privileges further, potentially gaining full control over the device. This could lead to unauthorized access to sensitive corporate data, interception of communications, installation of persistent malware, or disruption of device functionality. Given the widespread use of MediaTek chipsets in consumer and enterprise mobile devices, organizations relying on Android smartphones for communication, authentication, or mobile workforce operations could face increased risk. The vulnerability could also be exploited in targeted attacks against high-value individuals or sectors, such as government, finance, or critical infrastructure, where device compromise can have broader security implications. The lack of user interaction requirement means that once initial access is gained, attackers can exploit this vulnerability without alerting the user, complicating detection and response efforts.

Organizations should prioritize patching affected devices as soon as MediaTek or device manufacturers release updates addressing CVE-2025-20799. Until patches are available, limiting System-level access to trusted applications and enforcing strict privilege management policies can reduce exploitation risk. Employ mobile device management (MDM) solutions to monitor device integrity and restrict installation of untrusted apps. Regularly audit devices for signs of compromise, especially those with System privileges. Educate users and administrators about the risks of privilege escalation vulnerabilities and encourage prompt reporting of unusual device behavior. For high-security environments, consider deploying endpoint detection and response (EDR) tools capable of detecting suspicious memory corruption or privilege escalation attempts. Additionally, collaborate with vendors to obtain timely security updates and verify patch deployment status across the device fleet.