CVE-2025-21027: 
NixOS vulnerability analysis and mitigation

CVE-2025-21027 is a security vulnerability discovered in Samsung's ImsService component, reported on April 28, 2025. The vulnerability affects Android versions 13, 14, 15, and 16 on Samsung mobile devices. It involves improper verification of intent by broadcast receiver in ImsService prior to SMR Sep-2025 Release 1 (Samsung Mobile).

The vulnerability has been assigned a CVSS v3.1 base score of 4.4 (Medium) with the following vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L. The attack vector is Local (AV:L), requiring low attack complexity (AC:L) and low privileges (PR:L). No user interaction (UI:N) is needed for exploitation. The scope is unchanged (S:U), with low impact on both integrity (I:L) and availability (A:L), and no impact on confidentiality (C:N) (NVD).

When exploited, this vulnerability allows local attackers to temporarily disable the SIM card functionality on affected devices. This could potentially disrupt cellular communications and related services on the targeted device (Samsung Mobile).

Samsung has addressed this vulnerability in their September 2025 Security Maintenance Release (SMR). The patch adds proper permission verification to prevent unauthorized access. Users are advised to update their devices to the latest security patch level that includes SMR Sep-2025 Release 1 (Samsung Mobile).