CVE-2025-14747 identifies a denial of service vulnerability in the RTSP Service component of the Ningyuanda TC155 device, specifically version 57.0.2.0. The vulnerability arises from an unknown function within the RTSP service that, when manipulated by an attacker on the local network, causes the device to crash or become unresponsive, resulting in denial of service. The attack vector is local network access, requiring no privileges, authentication, or user interaction, which lowers the barrier for exploitation within a compromised or insider network environment. The CVSS 4.0 score of 5.3 reflects a medium severity, driven by the ease of attack (low complexity, no privileges) but limited by the requirement for local network access and the impact being limited to availability without confidentiality or integrity compromise. The vendor Ningyuanda was contacted early but has not issued any patches or advisories, and the exploit has been publicly disclosed, increasing the risk of opportunistic attacks. The lack of detailed technical information about the vulnerable function complicates targeted mitigation, but the vulnerability affects a core streaming protocol service (RTSP), which is commonly used for media streaming and surveillance devices. This could impact environments relying on these devices for video or media services, potentially disrupting operations.

For European organizations, the primary impact is service disruption due to denial of service on affected Ningyuanda TC155 devices. This could affect sectors such as surveillance, media streaming, or any operational technology environments where these devices are deployed. The requirement for local network access limits remote exploitation but increases risk from insider threats or lateral movement after initial compromise. Disruption of RTSP services could lead to loss of video feeds or media streams, impacting security monitoring or operational continuity. The absence of vendor patches increases exposure duration and risk. Organizations with critical infrastructure or high reliance on Ningyuanda devices may face operational downtime, increased incident response costs, and potential regulatory scrutiny if service availability impacts compliance. The medium severity suggests moderate risk but with potential for escalation if combined with other vulnerabilities or attack vectors.

Given the lack of vendor patches, European organizations should implement strict network segmentation to isolate Ningyuanda TC155 devices from general user networks, limiting local network access to trusted administrators and systems only. Deploy network monitoring and anomaly detection focused on RTSP traffic to identify unusual manipulation attempts. Employ access control lists (ACLs) and firewall rules to restrict RTSP service access to known and authorized devices. Regularly audit network topology to minimize exposure of vulnerable devices. Consider deploying intrusion detection/prevention systems (IDS/IPS) with signatures for known RTSP exploitation attempts. If possible, replace or upgrade affected devices to versions not impacted or alternative products with vendor support. Maintain up-to-date asset inventories to quickly identify affected devices. Prepare incident response plans for potential denial of service events impacting critical services. Engage with Ningyuanda or third-party security vendors for potential unofficial patches or workarounds.