What is CVE-2018-5770?

CVE-2018-5770 is a critical-severity vulnerability in Tendacn Ac15, classified under Initialization of a Resource with an Insecure Default. CVSS score: 9.8/10. Published 2018-03-20.

How severe is CVE-2018-5770?

Critical severity. CVSS v3 base score is 9.8 out of 10.

RCE in Tendacn Ac15

CVE-2018-5770

An issue was discovered on Tenda AC15 devices. A remote, unauthenticated attacker can make a request to /goform/telnet, creating a telnetd service on the device. This service is password protected; however, several default accounts exist on the device that are root accounts, which can be used to log in.

Published 2018-03-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.027 (85.3th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 85th percentile — 85.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.027 · newest: 0.027 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-1188 — Initialization of a Resource with an Insecure Default

References

www.fidusinfosec.com/tenda-ac15-unauthenticated-telnetd-start-cve-2018-5770/ (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2018-5770?: CVE-2018-5770 is a critical-severity vulnerability in Tendacn Ac15, classified under Initialization of a Resource with an Insecure Default. CVSS score: 9.8/10. Published 2018-03-20.
How severe is CVE-2018-5770?: Critical severity. CVSS v3 base score is 9.8 out of 10.