CVE-2025-21062 is a vulnerability identified in Samsung Mobile's Smart Switch application, a tool widely used for data transfer and device restoration on Samsung smartphones. The root cause is the use of a broken or risky cryptographic algorithm (classified under CWE-327), which undermines the security guarantees of the application. This cryptographic weakness allows a local attacker—someone with physical or local access to the device—to replace the restoring application component. The attack requires user interaction, meaning the victim must perform some action to trigger the exploit, but no prior privileges or authentication are necessary. The vulnerability affects versions of Smart Switch prior to 3.7.67.2, although specific affected versions were not enumerated. The CVSS v3.1 base score is 7.8, indicating a high severity level, with the vector AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. This means the attack vector is local, attack complexity is low, no privileges are required, user interaction is required, and the impact on confidentiality, integrity, and availability is high. The cryptographic flaw could allow attackers to manipulate the restoration process, potentially leading to unauthorized data access, data tampering, or denial of service by replacing critical application components. No public exploits are known at this time, but the vulnerability's nature suggests a significant risk if exploited. The vulnerability was reserved in November 2024 and published in October 2025, indicating a recent disclosure. Samsung users should be vigilant and update the Smart Switch application promptly once patches are available.

The vulnerability poses a significant risk to the confidentiality, integrity, and availability of data on Samsung devices using the affected Smart Switch versions. An attacker with local access can replace the restoring application, potentially injecting malicious code or altering data during device restoration. This could lead to unauthorized data disclosure, permanent data corruption, or denial of service by preventing successful device restoration. Organizations relying on Samsung devices for critical operations, especially those using Smart Switch for backup and restoration, may face operational disruptions and data breaches. The requirement for user interaction limits remote exploitation but does not eliminate risk, particularly in environments where devices are shared, lost, or physically accessible by attackers. The absence of known exploits in the wild reduces immediate threat but does not preclude future attacks. The vulnerability could be leveraged in targeted attacks against high-value individuals or organizations, especially where device restoration is part of incident response or device replacement workflows.

To mitigate this vulnerability, organizations and users should: 1) Update the Samsung Smart Switch application to version 3.7.67.2 or later as soon as the patch is available from Samsung, ensuring the cryptographic algorithm is replaced with a secure alternative. 2) Restrict physical and local access to devices, especially in sensitive environments, to prevent unauthorized local attackers from exploiting the vulnerability. 3) Educate users to avoid interacting with suspicious prompts or restoration processes that could trigger the exploit. 4) Implement device management policies that monitor and control application versions and enforce timely updates. 5) Use endpoint security solutions that can detect unauthorized modifications to applications or restoration processes. 6) For organizations, consider additional encryption and backup strategies independent of Smart Switch to reduce reliance on a single restoration tool. 7) Monitor security advisories from Samsung and cybersecurity communities for updates or exploit disclosures related to this vulnerability.