CVE-2025-20982 is a vulnerability classified as CWE-787 (Out-of-bounds Write) found in the KnoxVault trustlet of Samsung Mobile devices. KnoxVault is a trusted execution environment component responsible for securely managing authentication secrets and cryptographic keys. The vulnerability arises when setting an authentication secret, allowing a local attacker with privileged access to perform an out-of-bounds write operation in memory. This memory corruption can lead to arbitrary code execution, privilege escalation, or denial of service by corrupting critical data structures. The vulnerability requires the attacker to have high-level privileges on the device, such as root or system-level access, and does not require user interaction. The CVSS v3.1 score of 6.4 reflects medium severity, with high impact on confidentiality, integrity, and availability, but mitigated by the requirement for high privileges and high attack complexity. The flaw affects Samsung Mobile devices running firmware versions prior to the SMR (Security Maintenance Release) July 2025 Release 1. No public exploits or active exploitation have been reported to date. Samsung is expected to release patches in the July 2025 security update to address this issue. The vulnerability is significant because KnoxVault is a critical security component, and memory corruption here could undermine device security at a fundamental level.

The vulnerability could allow a local privileged attacker to corrupt memory in the KnoxVault trustlet, potentially leading to unauthorized access to sensitive authentication secrets or cryptographic keys. This could compromise device confidentiality by exposing protected data, integrity by enabling unauthorized code execution or modification of security-critical data, and availability by causing crashes or denial of service. Organizations relying on Samsung Mobile devices for secure communications or sensitive operations could face increased risk of device compromise, data leakage, or disruption. Although exploitation requires local privileged access, attackers who gain such access through other means (e.g., malware, insider threat) could leverage this vulnerability to escalate privileges or bypass security controls. The absence of known exploits reduces immediate risk, but the critical nature of the affected component means that timely patching is essential to prevent future attacks.

Organizations and users should apply the Samsung Security Maintenance Release (SMR) July 2025 Release 1 or later as soon as it becomes available, as this update contains the patch for CVE-2025-20982. Until patched, restrict local privileged access on Samsung Mobile devices by enforcing strict device management policies, disabling unnecessary root or system-level access, and monitoring for suspicious activity indicative of privilege escalation attempts. Employ mobile device management (MDM) solutions to enforce security policies and control app installations. Regularly audit device configurations and installed software to detect potential privilege escalation vectors. Additionally, educate users about the risks of granting elevated permissions to applications or processes. For organizations with high security requirements, consider isolating critical mobile devices from untrusted networks and enforcing strong authentication mechanisms to reduce the likelihood of initial compromise leading to local privileged access.