CUDY TR3000 · CVE-2026-129104 · Infrastructure
NO FIX YET · SEE WHAT TO DO
Cudy TR3000 routers before 2.5.42 let a logged-in administrator embed a newline in the DHCP lease time setting, which writes extra dnsmasq directives. An attacker with admin access can then change DNS answers for devices on the LAN or make dnsmasq fail to start.
first public Nov 13, 2026 · 1 source
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Anyone running a Cudy TR3000 router with firmware before 2.5.42 is affected, since the flaw is in the router's dnsmasq configuration handling. Exploitation requires administrator credentials on the router, so exposure is limited to networks where admin access is not tightly controlled. Teams that do not run this router model can skip it.
Not affected if default-config
Who cares cudy-tr3000, dnsmasq, router, self-hosted
2.5.42.2.5.42 or later.Cudy TR3000 before 2.5.42 contains a dnsmasq configuration injection vulnerability that allows authenticated administrators to inject directives by embedding a newline in the net.set_dhcp leasetime field. Attackers can append address= entries via /etc/init.d/dnsmasq to alter DNS answers for LAN clients, or insert invalid lines that stop dnsmasq.
This page as .md · .json · CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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