CVE-2025-61616 is a vulnerability identified in the NR (New Radio) modem firmware of Unisoc (Shanghai) Technologies Co., Ltd. chipsets T8100, T9100, T8200, and T8300. These chipsets are integrated into various Android devices running versions 13 through 16. The root cause is improper input validation (CWE-20), which allows specially crafted network packets to cause the modem subsystem to crash. This crash leads to a denial of service (DoS) condition, disrupting normal device operation. The vulnerability can be exploited remotely over the network without requiring any privileges or user interaction, increasing its risk profile. The CVSS v3.1 base score is 7.5 (high), reflecting the network attack vector, low attack complexity, and the impact on availability only. No known exploits have been reported yet, and no patches are currently linked, indicating that mitigation relies on vendor updates and defensive measures. The flaw does not affect confidentiality or integrity but can severely impact device availability, potentially disrupting communications and critical mobile services.

The primary impact of CVE-2025-61616 is a remote denial of service on devices using affected Unisoc chipsets, which can cause system crashes and service interruptions. For organizations, this can translate into loss of mobile connectivity, disruption of business operations relying on mobile devices, and potential cascading effects in environments dependent on continuous communication, such as emergency services or IoT deployments. Since exploitation requires no privileges or user interaction, attackers can easily target vulnerable devices en masse, potentially leading to widespread outages. The lack of confidentiality or integrity impact limits the risk of data breaches or unauthorized data manipulation, but availability disruption alone can have significant operational consequences, especially in critical infrastructure or enterprise environments with large mobile workforces.

Organizations should monitor Unisoc and device manufacturers for official patches addressing this vulnerability and apply them promptly once available. In the interim, network-level mitigations such as filtering or blocking suspicious NR modem traffic patterns may reduce exposure. Deploying intrusion detection systems (IDS) tuned to detect anomalous modem traffic could help identify exploitation attempts. Device management policies should enforce timely updates and restrict network access to trusted sources where feasible. For critical deployments, consider using devices with alternative chipsets or firmware versions not affected by this vulnerability until patches are released. Additionally, educating users and administrators about the risk and signs of device instability can aid in early detection and response.