CVE-2020-35757: An issue was discovered on Libre Wireless LS9 LS1.5/p7040 devices

This week

CRITICAL 9.8REMOTEMITIGATE

CVE-2020-35757 is a critical-severity flaw (CVSS 9.8) affecting ls9 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.8% (top 21%)
CISA exploited list	No
Weakness	CWE-306
Published	2021-05-03
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: librewireless

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-05-03 21:15 UTCPublished CVE record published
2026-06-17 03:14 UTCUpdated Record last modified

librewireless ls9 firmware MITIGATE

Affected: 7040

Fixed in: no fixed release known

Safe to downgrade to: a release before 7040

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-35757?

ls9 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-35757 being exploited?

CVE-2020-35757 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-35757 affect?

CVE-2020-35757 affects ls9 firmware. Severity is critical (CVSS 9.8). 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

How urgent is CVE-2020-35757?

Priority 64/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2020-35758 CRITICAL 9.8 MITIGATE An issue was discovered on Libre Wireless LS9 LS1.5/p7040 devices
CVE-2020-35756 HIGH 7.5 MITIGATE An issue was discovered on Libre Wireless LS9 LS1.5/p7040 devices
CVE-2020-35755 HIGH 7.5 MITIGATE An issue was discovered on Libre Wireless LS9 LS1.5/p7040 devices

References

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