CVE-2025-61618 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 vulnerability stems from improper input validation (classified under CWE-20), which allows specially crafted inputs to cause a system crash. This crash results in a denial of service (DoS) condition remotely without requiring any authentication or user interaction, making the attack vector network-based and straightforward to exploit. The CVSS v3.1 score is 7.5, indicating high severity, with the vector string AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H, meaning the attack can be launched remotely over the network with low attack complexity, no privileges, and no user interaction, impacting only availability. The vulnerability does not affect confidentiality or integrity but can disrupt device operation, potentially impacting mobile communications and dependent services. No patches or known exploits are currently available, but the vulnerability is publicly disclosed and should be considered a significant risk for affected devices. The NR modem is critical for 5G communications, so disruption could affect cellular connectivity and related services.

For European organizations, the primary impact of CVE-2025-61618 is the potential for remote denial of service on devices using affected Unisoc chipsets, which could disrupt mobile communications and IoT operations. This can affect enterprise mobile devices, critical infrastructure relying on cellular connectivity, and consumer devices used in business contexts. Disruptions in availability could lead to operational downtime, loss of communication capabilities, and potential cascading effects on services dependent on mobile networks. Since the vulnerability requires no privileges or user interaction, attackers could exploit it remotely at scale, increasing the risk of widespread service interruptions. Organizations in sectors such as telecommunications, finance, healthcare, and manufacturing that rely on mobile connectivity or embedded systems with these chipsets are particularly at risk. The lack of patches increases exposure time, necessitating proactive mitigation.

1. Implement network-level filtering to monitor and block suspicious or malformed NR modem traffic that could trigger the vulnerability. 2. Employ anomaly detection systems to identify unusual modem behavior or unexpected device crashes. 3. Restrict exposure of vulnerable devices to untrusted networks, especially public or unsecured Wi-Fi and cellular networks. 4. Coordinate with device manufacturers and Unisoc for timely updates and patches; prioritize patch deployment once available. 5. For critical infrastructure, consider fallback communication methods or redundancy to maintain availability during potential disruptions. 6. Educate IT and security teams about this vulnerability to enhance monitoring and incident response readiness. 7. Engage with mobile service providers to understand their mitigation strategies and potential network-level protections. 8. Maintain an inventory of devices using affected chipsets to assess exposure and prioritize risk management.