CVE-2025-21079 is a vulnerability classified under CWE-20 (Improper Input Validation) found in Samsung Members, a pre-installed app on Samsung mobile devices. The flaw exists in versions prior to 5.5.01.3 and allows remote attackers to exploit improper validation of input URLs. By crafting a malicious URL, an attacker can trick a user into triggering the vulnerability, which then enables the attacker to connect to arbitrary URLs and launch arbitrary activities within the Samsung Members app context. This can lead to unauthorized actions performed with the app's privileges, potentially disrupting app functionality or causing denial of service. The vulnerability requires user interaction, such as clicking a malicious link, which is a common attack vector via phishing or malicious websites. 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 primarily affects integrity and availability, with no direct confidentiality loss reported. No public exploits have been observed yet, but the vulnerability is published and should be addressed promptly. Samsung Members is widely used on Samsung mobile devices, which have significant market penetration globally, including Europe.

For European organizations, this vulnerability poses a risk primarily to mobile device integrity and availability. Attackers exploiting this flaw could cause disruptions in the Samsung Members app, potentially affecting device stability or enabling further malicious activities leveraging the app's privileges. While confidentiality impact is minimal, the ability to launch arbitrary activities could be leveraged in multi-stage attacks targeting corporate mobile users. Organizations with mobile workforce relying on Samsung devices may experience operational disruptions or targeted attacks via phishing campaigns exploiting this vulnerability. The lack of known exploits reduces immediate risk but does not eliminate the threat, especially given the widespread use of Samsung devices in Europe. Critical sectors such as finance, government, and telecommunications, which often use Samsung devices, could be targeted to disrupt services or gain footholds in mobile environments.

1. Immediately update Samsung Members app to version 5.5.01.3 or later where the vulnerability is patched. 2. Implement mobile device management (MDM) policies to enforce app updates and restrict installation of untrusted apps or links. 3. Educate users on phishing risks and the dangers of clicking unknown links, especially those that could trigger app activities. 4. Limit Samsung Members app permissions where feasible to reduce potential impact of arbitrary activity launches. 5. Monitor network traffic for unusual URL connections initiated from mobile devices. 6. Employ endpoint detection and response (EDR) solutions on mobile devices to detect anomalous app behavior. 7. Coordinate with Samsung support for any additional security advisories or patches. 8. Consider temporary disabling or restricting Samsung Members app usage in high-risk environments until patched.