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ClingSTUN Malware Exploits IoT Vulnerabilities Using Public STUN Servers

Researchers have identified a new Linux-based malware called ClingSTUN that exploits at least 24 known security flaws across various IoT devices, including routers and surveillance systems from multiple manufacturers. The malware leverages legitimate public STUN servers to maintain covert communication with infected devices, avoiding detection by traditional command-and-control infrastructure. The attacks target vulnerabilities dating from 2021 to earlier this year, indicating a broad and ongoing exploitation effort.

D-Link finds no fix for critical DIR-822A router flaw with public exploit code

D-Link disclosed a maximum-severity vulnerability, CVE-2026-86296, affecting its legacy DIR-822A dual-band routers, caused by a stack-based buffer overflow in the DHCP server component. The bug requires no authentication and can be triggered by sending crafted DHCP packets over the local network, potentially crashing the device or enabling remote code execution. A proof-of-concept exploit is already public, and D-Link has not yet released a patch. The company is also probing a second flaw, CVE-2026-86510, an out-of-bounds write in the L2TP parser reported by the same researcher.