CVE-2025-21067 is an out-of-bounds read vulnerability classified under CWE-125 affecting Samsung Notes, a note-taking application on Samsung mobile devices. The flaw occurs during the allocation of the image buffer, where the application improperly handles memory boundaries, allowing local attackers to read memory outside the allocated buffer. This can lead to exposure of sensitive information stored in adjacent memory or cause application crashes due to memory corruption. The vulnerability requires local access to the device but does not require any privileges or user interaction, making it easier for an attacker with physical or local access to exploit. The CVSS 3.1 base score is 4.0, reflecting a medium severity primarily due to the lack of confidentiality impact and remote exploitability. No public exploits or active exploitation have been reported to date. Samsung Notes versions prior to 4.4.30.63 are affected, and users are advised to update once patches are released. The vulnerability highlights the importance of secure memory management in mobile applications to prevent unauthorized memory access and potential data leakage.

For European organizations, the impact of CVE-2025-21067 is moderate but non-negligible. While the vulnerability does not allow remote exploitation or privilege escalation, it can be leveraged by insiders or attackers with local device access to read out-of-bounds memory, potentially exposing sensitive information or causing application instability. This could undermine data integrity within Samsung Notes, which may be used to store confidential corporate information. Organizations with employees using Samsung mobile devices for work, especially those relying on Samsung Notes for sensitive data, face risks of data leakage or disruption of note-taking functionality. The lack of remote exploitability limits the threat surface, but physical device security and endpoint protection become critical. The vulnerability could also be used as part of a multi-stage attack chain if combined with other exploits.

1. Update Samsung Notes to version 4.4.30.63 or later as soon as the patch is available to address the out-of-bounds read issue. 2. Enforce strict device access controls and ensure that only trusted users have local access to Samsung mobile devices to reduce the risk of local exploitation. 3. Implement mobile device management (MDM) solutions to monitor application versions and enforce timely updates. 4. Educate users about the risks of installing untrusted applications or granting unnecessary permissions that could facilitate local attacks. 5. Monitor Samsung Notes for abnormal behavior or crashes that could indicate exploitation attempts. 6. Consider encrypting sensitive notes or using alternative secure note-taking applications until the vulnerability is patched. 7. Regularly audit and review mobile device security policies to ensure compliance with best practices.