CVE-2025-61619 identifies a vulnerability in the 5G NR modem firmware of Unisoc (Shanghai) Technologies Co., Ltd.'s T8100, T9100, T8200, and T8300 chipsets. These chipsets are integrated into various Android devices running versions 13 through 16. The root cause is improper input validation (CWE-20) within the modem's handling of network data, which can be exploited remotely by an attacker to trigger a system crash, resulting in a denial of service (DoS). The vulnerability does not require any privileges or user interaction, making it easier to exploit over the network. The CVSS 3.1 base score of 7.5 reflects the high impact on availability, with no impact on confidentiality or integrity. The flaw could be triggered by specially crafted network packets sent to the modem, causing it to malfunction and crash the device or disrupt network connectivity. Although no exploits have been reported in the wild yet, the potential for remote DoS attacks poses a significant risk to device stability and service continuity. The lack of available patches at the time of publication necessitates vigilance and proactive mitigation by device manufacturers and users.

For European organizations, this vulnerability could lead to significant disruptions in mobile communications, especially for enterprises relying on cellular connectivity for critical operations, such as remote work, IoT deployments, and mobile services. The denial of service could cause devices to crash or lose network connectivity, impacting operational continuity and potentially leading to productivity losses. Telecommunications providers using Unisoc chipsets in their network equipment or customer devices might face increased support costs and customer dissatisfaction. The impact is particularly relevant for sectors like finance, healthcare, and public services, where reliable mobile connectivity is essential. Additionally, the vulnerability could be exploited in targeted attacks against high-value individuals or organizations, amplifying its strategic risk. The absence of known exploits currently reduces immediate risk but does not eliminate the threat, especially as attackers often develop exploits after public disclosure.

Organizations should monitor Unisoc and device manufacturers for firmware updates addressing CVE-2025-61619 and apply patches promptly once available. Until patches are released, network-level protections such as filtering or rate-limiting suspicious traffic targeting the modem interfaces may reduce exposure. Device administrators should audit and inventory devices using affected Unisoc chipsets to assess risk exposure. Employing mobile device management (MDM) solutions can facilitate rapid deployment of updates and configuration changes. Additionally, organizations should implement network segmentation to isolate critical systems from potentially vulnerable mobile devices. Security teams should enhance monitoring for unusual device crashes or connectivity losses that may indicate exploitation attempts. Collaboration with telecom providers to understand device chipset usage and coordinate mitigation efforts is advisable. Finally, educating users about the importance of timely updates and reporting connectivity issues can aid early detection and response.