What is CVE-2020-35757?

CVE-2020-35757 is a critical-severity vulnerability in Librewireless Ls9, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2021-05-03.

How severe is CVE-2020-35757?

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

Auth bypass in Librewireless Ls9

CVE-2020-35757

An issue was discovered on Libre Wireless LS9 LS1.5/p7040 devices. There is Unauthenticated Root ADB Access Over TCP. The LS9 web interface provides functionality to access ADB over TCP. This is not enabled by default, but can be enabled by sending a crafted request to a web management interface endpoint. Requests made to this endpoint do not require authentication. As such, any unauthenticated user who is able to access the web interface will be able to gain root privileges on the LS9 module.

Vulnerability class: Broken Authentication

Published 2021-05-03 · last modified 2026-06-17.

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.

EPSS exploit prediction

EPSS: 0.018 (77.8th percentile), scored 2026-10-03.

Low probability of exploitation in the next 30 days, but still tracked. 78th percentile — 77.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: 0.000

Affected products

Librewireless Ls9
Librewireless Ls9 Firmware — versions 7040

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

www.iot-inspector.com/blog/advisory-multiple-issues-libre-wireless-ls9/ (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2020-35757?: CVE-2020-35757 is a critical-severity vulnerability in Librewireless Ls9, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2021-05-03.
How severe is CVE-2020-35757?: Critical severity. CVSS v3 base score is 9.8 out of 10.