CVE-2025-11133 is a vulnerability identified in the NR modem firmware of Unisoc (Shanghai) Technologies Co., Ltd. chipsets T8100, T9100, T8200, and T8300, which 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 incoming data, which can be maliciously crafted to trigger a system crash remotely. This vulnerability does not require any privileges or user interaction, making it remotely exploitable over the network. The impact is a denial of service condition where the device's modem subsystem crashes, potentially disrupting cellular connectivity and device availability. The CVSS v3.1 score is 7.5, reflecting a high severity primarily due to the network attack vector, low attack complexity, and no need for privileges or user interaction. While no known exploits have been reported in the wild and no patches are currently available, the vulnerability poses a significant risk to device stability and service continuity. The Unisoc chipsets affected are commonly used in mid-range and some high-end smartphones, especially in markets where Unisoc has a strong presence. The vulnerability’s exploitation could affect mobile communications, impacting both consumer and enterprise users relying on these devices for connectivity.

For European organizations, the primary impact of CVE-2025-11133 is the potential disruption of mobile communications due to modem crashes causing denial of service. This can affect employees using vulnerable devices for business communications, remote work, and access to corporate resources. Telecommunications providers using Unisoc chipsets in network equipment or customer-premises devices may experience service degradation or outages. Critical sectors such as finance, healthcare, and government that depend on reliable mobile connectivity could face operational interruptions. The inability to maintain stable cellular connections could also hinder emergency response and IoT device functionality. Although the vulnerability does not compromise data confidentiality or integrity, the availability impact can lead to productivity losses and increased support costs. The lack of patches increases the window of exposure, necessitating proactive risk management. Organizations with large fleets of mobile devices or those in regions with high Unisoc device penetration are at greater risk.

1. Monitor Unisoc and device manufacturers for official patches or firmware updates addressing this vulnerability and apply them promptly once available. 2. Limit network exposure of vulnerable devices by restricting access to untrusted networks and employing VPNs or secure tunnels for remote connections. 3. Implement network-level anomaly detection to identify unusual modem behavior or repeated crashes indicative of exploitation attempts. 4. Enforce strict device management policies, including mobile device management (MDM) solutions that can isolate or quarantine affected devices if instability is detected. 5. Educate users about the risk and advise minimizing use of vulnerable devices in critical operational contexts until patched. 6. Collaborate with telecom providers to monitor network health and report any unusual patterns that may suggest exploitation. 7. Consider alternative devices or chipsets for critical roles if patching timelines are uncertain. 8. Maintain up-to-date backups and incident response plans to quickly recover from potential service disruptions.