CVE-2025-21057 is a vulnerability classified under CWE-927 (Use of Implicit Intent for Sensitive Communication) affecting Samsung Notes on Samsung Mobile devices prior to version 4.4.30.63. The issue arises because the application uses implicit intents to share sensitive note data, which can be intercepted or accessed by unauthorized local applications or attackers with local device access. Implicit intents in Android allow communication between components without specifying the exact recipient, which can lead to unintended data exposure if sensitive information is shared this way. In this case, local attackers can exploit this design flaw to access shared notes, compromising confidentiality. The CVSS v3.1 base score is 4.0, indicating medium severity, with attack vector limited to local (AV:L), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N), and impact limited to confidentiality (C:L) without affecting integrity or availability. The vulnerability does not require authentication or user interaction, increasing the risk in environments where local access is possible. There are no known exploits in the wild, and no official patches have been linked yet, but the vendor has reserved the CVE and published the vulnerability details. This vulnerability highlights the risks of improper intent usage in Android apps handling sensitive data.

For European organizations, the primary impact of CVE-2025-21057 is the potential unauthorized local access to sensitive notes stored or shared via Samsung Notes on Samsung mobile devices. This could lead to leakage of confidential business information, intellectual property, or personal data, undermining data confidentiality. Since the attack requires local access, the threat is significant in scenarios involving lost or stolen devices, insider threats, or environments where devices are shared or accessible by multiple users. The vulnerability does not affect data integrity or availability, so operational disruption or data tampering risks are minimal. However, the exposure of sensitive notes could lead to compliance issues under GDPR if personal or sensitive data is involved. Organizations relying heavily on Samsung mobile devices for note-taking and data sharing should consider this vulnerability a moderate risk to their mobile data security posture.

1. Monitor Samsung Mobile and Samsung Notes vendor communications for official patches or updates addressing CVE-2025-21057 and apply them promptly once available. 2. Until patched, restrict physical and local access to Samsung devices used within the organization to trusted personnel only. 3. Implement mobile device management (MDM) policies that limit installation of untrusted or unnecessary local applications that could exploit implicit intents. 4. Educate users about the risks of sharing sensitive notes and encourage use of encrypted note-taking or secure communication alternatives. 5. Disable or restrict the use of implicit intents for sensitive data sharing via custom device policies or app configurations if possible. 6. Regularly audit Samsung devices for unauthorized applications or suspicious activity that could indicate exploitation attempts. 7. Consider encrypting sensitive notes at rest and in transit within the device to add an additional layer of protection.