CVE-2025-21079 is a vulnerability classified under CWE-20 (Improper Input Validation) affecting the Samsung Members application on Samsung mobile devices prior to version 5.5.01.3. The flaw arises because the app does not properly validate input URLs, allowing remote attackers to craft malicious URLs that, when interacted with by a user, can cause the app to connect to arbitrary URLs and launch arbitrary activities with the privileges of Samsung Members. This can lead to unauthorized actions within the app context, potentially disrupting app functionality or enabling further attacks leveraging the app's privileges. The vulnerability requires user interaction, such as clicking a malicious link, which triggers the exploit. The CVSS v3.1 score is 7.1 (high), reflecting network attack vector, low attack complexity, no privileges required, but user interaction needed. The impact affects integrity and availability, but not confidentiality. No patches or exploits in the wild are currently reported, but the vulnerability is publicly disclosed and should be addressed promptly. Samsung Members is a pre-installed app on many Samsung devices, used for device support and community engagement, making it a common target for attackers aiming to leverage trusted app privileges.

For European organizations, this vulnerability poses a risk primarily to employees and users with Samsung mobile devices running vulnerable versions of Samsung Members. The ability to launch arbitrary activities with app privileges could be exploited to disrupt device functionality, potentially affecting device availability or integrity of app operations. While confidentiality impact is minimal, the integrity and availability impacts could lead to denial of service or manipulation of app behavior, which may indirectly affect business operations relying on mobile device availability. Organizations with large Samsung device deployments, especially in sectors like finance, healthcare, or government, where mobile device security is critical, could face increased risk. The requirement for user interaction limits mass exploitation but targeted phishing or social engineering campaigns could be effective. The lack of known exploits in the wild reduces immediate risk but does not eliminate it, especially as public disclosure may lead to future exploit development.

The primary mitigation is to update the Samsung Members app to version 5.5.01.3 or later, where the vulnerability is fixed. Organizations should enforce mobile device management (MDM) policies that ensure timely app updates and restrict installation of untrusted apps. User education to avoid clicking suspicious links is critical given the user interaction requirement. Additionally, restricting Samsung Members app permissions, especially those related to URL handling and activity launching, can reduce the attack surface. Network-level controls such as URL filtering and blocking known malicious domains can help prevent exploitation attempts. Monitoring device logs for unusual Samsung Members activity may provide early detection of exploitation attempts. For high-security environments, consider restricting or disabling Samsung Members if not essential. Finally, coordinate with Samsung support channels for any additional patches or advisories.