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#10 BleepingComputer general August 24, 2026 at 21:14 UTC

Unpatched Calix flaw lets hackers bypass NAT to expose internal devices

By Bill Toulas

AI Summary

An unpatched vulnerability in Calix GS7 XGS (GS5239XG) residential routers — deployed by multiple U.S. broadband ISPs — allows remote unauthenticated attackers to create arbitrary port-forwarding rules, effectively bypassing NAT and exposing internal network devices directly to the public internet. With no patch currently available, ISPs and their subscribers face persistent exposure, and the scope across multiple broadband providers amplifies the potential attack surface.

Relevance score: 72.0/100

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