Nexcorium Botnet's Exploitation of CVE-2024-3721 in TBK DVRs
In April 2026, cybersecurity researchers identified a new variant of the Mirai botnet, named Nexcorium, actively exploiting CVE-2024-3721—a command injection vulnerability in TBK DVR-4104 and DVR-4216 devices. By sending specially crafted HTTP POST requests to the vulnerable endpoint, attackers gained remote control over these devices, integrating them into a botnet used for large-scale Distributed Denial-of-Service (DDoS) attacks. The campaign, attributed to a group known as 'Nexus Team,' highlights the persistent threat posed by unpatched IoT devices in critical environments. ([fortinet.com](https://www.fortinet.com/blog/threat-research/tracking-mirai-variant-nexcorium-a-vulnerability-driven-iot-botnet-campaign?utm_source=openai)) This incident underscores the ongoing risks associated with IoT vulnerabilities, particularly in devices that are often overlooked in security protocols. The exploitation of CVE-2024-3721 by Nexcorium serves as a stark reminder of the importance of timely patching and robust security measures to protect against evolving botnet threats.
Kill Chain
