CVE-2025-21062 is a vulnerability identified in Samsung Mobile's Smart Switch application, a tool used for data transfer and restoration on Samsung devices. The root cause is the use of a broken or risky cryptographic algorithm (classified under CWE-327), which undermines the security guarantees of the restoration process. This cryptographic weakness allows a local attacker—someone with physical or logical local access to the device—to replace the restoring application component. The attack requires user interaction, meaning the victim must perform some action, such as approving a prompt or running a malicious file. The vulnerability affects all versions prior to 3.7.67.2, although specific affected versions are not listed. The CVSS 3.1 score of 7.8 reflects high severity, with attack vector local (AV:L), low attack complexity (AC:L), no privileges required (PR:N), user interaction required (UI:R), and impacts on confidentiality, integrity, and availability (C:H/I:H/A:H). This means an attacker can fully compromise data confidentiality, alter or replace data, and disrupt availability of the restoration function. No known exploits have been reported in the wild yet, but the vulnerability poses a significant risk due to the critical role of Smart Switch in device data management. The cryptographic flaw likely allows bypassing signature verification or tampering detection, enabling malicious code injection during restoration. This could lead to data theft, device compromise, or denial of service.

For European organizations, the impact of this vulnerability is significant, especially those relying on Samsung devices for business operations or data management. The ability for a local attacker to replace the restoring application threatens the confidentiality of sensitive corporate data during device migration or recovery. Integrity is compromised as attackers can inject malicious code or alter restoration processes, potentially implanting persistent malware or backdoors. Availability is also at risk if restoration fails or is manipulated to cause device malfunction. This vulnerability could be exploited in scenarios such as insider threats, physical device theft, or social engineering to induce user interaction. Organizations with bring-your-own-device (BYOD) policies or mobile device management (MDM) systems that use Smart Switch are particularly vulnerable. The lack of required privileges lowers the barrier for exploitation, increasing risk. Although no public exploits exist yet, the high CVSS score and critical impacts necessitate urgent attention to prevent potential targeted attacks or malware campaigns leveraging this flaw.

The primary mitigation is to update Samsung Smart Switch to version 3.7.67.2 or later, where the cryptographic algorithm issue has been resolved. Organizations should enforce strict update policies on all Samsung devices and ensure users apply patches promptly. Restrict local access to devices by implementing physical security controls and limiting device usage to trusted personnel. Educate users to recognize and avoid suspicious prompts or actions that could trigger the vulnerability. Employ endpoint protection solutions capable of detecting unauthorized application modifications. For environments with BYOD policies, consider restricting or monitoring the use of Smart Switch for device restoration. Additionally, implement device encryption and strong authentication to reduce the impact of local attacks. Regularly audit device software versions and configurations to ensure compliance. Finally, monitor security advisories from Samsung and related threat intelligence sources for emerging exploits or additional patches.