CVE-2025-61616 is a vulnerability identified in the NR (New Radio) 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 processing of network data, which can be exploited remotely by an attacker without requiring any privileges or user interaction. Exploitation leads to a system crash, causing a denial of service (DoS) condition. The CVSS v3.1 base score is 7.5, reflecting high severity due to the network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N), and impact limited to availability (A:H) without affecting confidentiality or integrity. The vulnerability does not currently have publicly known exploits in the wild, but the potential for remote DoS on mobile devices is significant. The lack of authentication or user interaction requirements increases the risk of widespread exploitation. The affected chipsets are commonly used in mid-range and budget Android smartphones, particularly in markets where Unisoc is a prominent supplier. The vulnerability underscores the importance of robust input validation in modem firmware to prevent service disruptions.

The primary impact of CVE-2025-61616 is a remote denial of service on affected devices, leading to system crashes and loss of availability. This can disrupt mobile communications, data connectivity, and critical services relying on cellular networks. For organizations, this could mean interrupted business operations, degraded user experience, and potential loss of revenue, especially for enterprises dependent on mobile workforce or IoT devices using these chipsets. The vulnerability does not compromise data confidentiality or integrity, but the availability impact alone can be severe in sectors such as telecommunications, emergency services, and financial services. The ease of exploitation without authentication or user interaction increases the threat landscape, potentially allowing attackers to target large numbers of devices remotely. The absence of known exploits in the wild currently limits immediate risk, but the vulnerability remains a significant concern until patches are deployed.

Organizations and users should monitor Unisoc and device manufacturers for firmware or software updates addressing this vulnerability and apply patches promptly once available. In the interim, network-level mitigations such as filtering or rate-limiting suspicious traffic targeting the modem's network interfaces can reduce exposure. Mobile network operators can implement anomaly detection to identify and block exploit attempts. Device administrators should enforce strict network security policies and consider deploying endpoint protection solutions capable of detecting abnormal modem behavior. For enterprises deploying devices with affected chipsets, segmenting critical systems and limiting exposure to untrusted networks can help mitigate risk. Collaboration with vendors to obtain timely security updates and validation of patch effectiveness is essential. Additionally, educating users about the importance of applying updates and avoiding untrusted networks can reduce exploitation likelihood.