CVE-2025-21077 is a vulnerability identified in Samsung Email, a native email client on Samsung mobile devices, prior to version 6.2.06.0. The root cause is improper input validation (CWE-20), which allows a local attacker with limited privileges (PR:L) to launch arbitrary activities within the Samsung Email application context. This means that an attacker who already has some level of access to the device can craft inputs that cause the email app to perform unintended actions with its privileges. The vulnerability does not require user interaction (UI:N) and has low attack complexity (AC:L), but it is limited to local attack vectors (AV:L), meaning remote exploitation is not feasible. The impact on confidentiality is limited (C:L), with no impact on integrity or availability. The vulnerability does not have known exploits in the wild as of the publication date (2025-11-05). Since Samsung Email is commonly pre-installed on Samsung smartphones, this vulnerability could be present on many devices globally. The vulnerability is classified as low severity with a CVSS v3.1 base score of 3.3. The lack of a patch link suggests that a fix may be pending or integrated in a future update (version 6.2.06.0 or later).

For European organizations, the impact of CVE-2025-21077 is limited but non-negligible. The vulnerability requires local access with some privileges, so it could be exploited by insiders or attackers who have already compromised a device. Exploitation could allow launching arbitrary activities with Samsung Email privileges, potentially enabling further local privilege escalation or lateral movement within the device. However, since the vulnerability does not affect confidentiality, integrity, or availability significantly, the direct risk to organizational data or services is low. Organizations with employees using Samsung mobile devices for corporate email should be aware of this vulnerability, especially in sectors where insider threats or device theft are concerns. The lack of remote exploitation capability reduces the risk of widespread attacks. Nevertheless, the vulnerability could be leveraged as part of a multi-stage attack chain on compromised devices.

1. Ensure all Samsung mobile devices used within the organization have Samsung Email updated to version 6.2.06.0 or later once the patch is officially released. 2. Implement strict device access controls to prevent unauthorized local access, including strong lock screens, biometric authentication, and device encryption. 3. Limit installation of untrusted applications and monitor for suspicious local activity that could indicate attempts to exploit local vulnerabilities. 4. Educate users about the risks of granting local access to unknown parties and the importance of timely software updates. 5. Employ mobile device management (MDM) solutions to enforce update policies and monitor device compliance. 6. Consider restricting the use of Samsung Email on devices that handle highly sensitive information until patched. 7. Monitor security advisories from Samsung for official patches and additional guidance.