Vulnerability in Zbtlink Cpe2801 Firmware

CVE-2026-66747

Zbtlink router firmware ships an embedded remote-control implant, ENDLESSDOORS, present in every published build across the product line. It is the open-source ycsunjane/rctl tool built in as an OpenWrt package (librctl.so), started at boo…

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-66747?
CVE-2026-66747 is a critical-severity vulnerability in Zbtlink Cpe2801 Firmware, classified under CWE-506. CVSS score: 9.8/10. Published 2026-08-05.
How severe is CVE-2026-66747?
Critical severity. CVSS v3 base score is 9.8 out of 10.