International Cyber Digest(@IntCyberDigest):VulnCheck found a backdoor in Zbtlink routers. Chinese router maker Zbtlink then replied the code in its firmware is "solely intended for after-sales maintenance." Its download page has since pulled the affected firmware over "firmware security vulnerabilities." 👀 VulnCheck's Jacob Baines says 20+ Zbtlink models ship with a root-level implant that phones home to a hardcoded C2 with no authentication, anyone on the network path can hijack it. Stay vigilant. These routers are sold as ZBT, ZBTWiFi and Wiflyer on Amazon and Alibaba.

International Cyber Digest@IntCyberDigest

2026.08.06 23:18

VulnCheck found a backdoor in Zbtlink routers. Chinese router maker Zbtlink then replied the code in its firmware is "solely intended for after-sales maintenance." Its download page has since pulled the affected firmware over "firmware security vulnerabilities." 👀 VulnCheck's Jacob Baines says 20+ Zbtlink models ship with a root-level implant that phones home to a hardcoded C2 with no authentication, anyone on the network path can hijack it. Stay vigilant. These routers are sold as ZBT, ZBTWiFi and Wiflyer on Amazon and Alibaba.

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