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CVE-2026-71961

HighPublished

Cudy WR3000 2.0 OS Command Injection via Mesh MQTT Command Handler

Published: Aug 19, 2026
Updated: Aug 31, 2026
Assigning CNA: VulnCheck
Evidence observed: Aug 22, 2026

Primary CVSS

8.7/ 10High

nvd · CVSS 4.0

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/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

EPSS probability estimate

3.1%

Low · next 30 days

Percentile: 86.9%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Cudy WR3000 2.0 running firmware before 2.5.24 contains an OS command injection vulnerability that allows authenticated attackers to execute arbitrary OS commands with root privileges by sending unsanitized input through the mesh MQTT command interface. The sync_command binary forwards unsanitized input directly to a shell execution sink in command.lua, enabling attackers with access to the MQTT broker to exploit the default-enabled command execution path to achieve full root-level system compromise.

Sources

the-same-key-opens-every-box-cve-2026-71960-hard-coded-jwt-secret-in-cudy-wr3000-mesh-mqttExploit
PoC toolkit that unpacks router firmware, decrypts device secrets, forges JWT tokens, and exploits CVE-2026-71960/71961 to take over Cudy WR3000 mesh MQTT brokers.

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