CVE-2025-47371 is a vulnerability identified in Qualcomm Snapdragon platforms involving a reachable assertion failure (CWE-617) triggered when a user equipment (UE) receives an LTE Radio Link Control (RLC) packet containing an invalid transport block (TB). The RLC layer is responsible for segmentation, reassembly, and error correction in LTE data transmission. An invalid TB in an RLC packet causes the assertion to fail, leading to a transient denial of service (DoS) condition where the affected device temporarily loses LTE connectivity or experiences service disruption. This vulnerability affects a broad spectrum of Qualcomm products, including numerous Snapdragon mobile platforms (from Snapdragon 4 Gen 2 to Snapdragon 8 Gen 3), FastConnect wireless subsystems, automotive 5G modem-RF systems, and various wireless connectivity chips (e.g., QCA series, WCD series, WCN series). The flaw does not require any privileges or user interaction to exploit but does require the attacker to send malformed LTE RLC packets to the target device, implying network proximity or control over the LTE radio environment. The CVSS v3.1 score of 6.5 reflects a medium severity due to the impact on availability and ease of exploitation without privileges, but limited scope as it does not affect confidentiality or integrity. No patches or known exploits are currently available, highlighting the need for vigilance and proactive mitigation. The vulnerability's root cause is a reachable assertion failure, which is a programming error where an assertion meant to catch invalid states is triggered by crafted input, causing the affected software to halt or reset the LTE stack temporarily.

The primary impact of CVE-2025-47371 is a transient denial of service affecting LTE connectivity on devices using vulnerable Qualcomm Snapdragon platforms. This can disrupt mobile broadband services, causing dropped connections, interrupted data sessions, and degraded user experience. For end users, this may manifest as temporary loss of internet access or call drops. For enterprises and critical infrastructure relying on LTE for connectivity—such as IoT deployments, automotive telematics, fixed wireless access, and emergency communication systems—this could lead to operational disruptions and potential safety risks. Although the DoS is transient, repeated exploitation could cause persistent service degradation or device instability. Since the vulnerability does not compromise confidentiality or integrity, data theft or manipulation is not a concern. However, the widespread presence of affected Snapdragon chipsets in smartphones, automotive systems, and wireless modules globally means the attack surface is large. Attackers with access to LTE radio channels could exploit this to disrupt service in targeted areas or against specific users. The lack of required privileges or user interaction lowers the barrier for exploitation, increasing risk in hostile network environments or where attackers can spoof LTE packets.

1. Monitor Qualcomm and device vendors for official patches or firmware updates addressing CVE-2025-47371 and apply them promptly once available. 2. Implement network-level filtering and anomaly detection on LTE infrastructure to identify and block malformed RLC packets with invalid transport blocks before they reach end devices. 3. Deploy LTE base station and radio access network (RAN) security controls to prevent unauthorized injection or replay of malicious LTE packets. 4. For enterprise and critical IoT deployments, consider fallback connectivity options or redundancy to mitigate transient LTE outages. 5. Collaborate with mobile network operators to enhance detection of abnormal LTE signaling patterns indicative of exploitation attempts. 6. Conduct security assessments of devices using affected Snapdragon platforms to evaluate susceptibility and operational impact. 7. Educate security teams about this vulnerability to improve incident response readiness for transient LTE DoS events. 8. Where feasible, isolate critical systems from untrusted LTE networks or use VPNs and secure tunnels to reduce exposure. 9. Encourage Qualcomm and ecosystem partners to improve assertion handling and input validation in LTE protocol stacks to prevent similar issues in the future.