How severe is CVE-2020-35757?

CVE-2020-35757 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-35757 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-35757?

CVE-2020-35757 affects Librewireless Ls9 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-35757?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2020-35757 published?

CVE-2020-35757 was published on 2021-05-03 and last updated on 2026-06-17.

CVE-2020-35757

CVE-2020-35757 is a critical-severity vulnerability in Librewireless Ls9 Firmware with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-306.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 9.3
EPSS exploit prediction: 2% (76th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-306
Affected product: Librewireless Ls9 Firmware
Published: 2021-05-03
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2020-35757?: CVE-2020-35757 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-35757 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-35757?: CVE-2020-35757 affects Librewireless Ls9 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-35757?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2020-35757 published?: CVE-2020-35757 was published on 2021-05-03 and last updated on 2026-06-17.

References

https://www.iot-inspector.com/blog/advisory-multiple-issues-libre-wireless-ls9/

Affected products (1)

cpe:2.3:o:librewireless:ls9_firmware:7040:*:*:*:*:*:*:*

More vulnerabilities in Librewireless Ls9 Firmware

CVE-2020-35758 — Critical (CVSS 9.8): An issue was discovered on Libre Wireless LS9 LS1.5/p7040 devices. There is a Authentication Bypass in the Web…
CVE-2020-35756 — High (CVSS 7.5): An issue was discovered on Libre Wireless LS9 LS1.5/p7040 devices. There is a luci_service GETPASS Configuration…
CVE-2020-35755 — High (CVSS 7.5): An issue was discovered on Libre Wireless LS9 LS1.5/p7040 devices. There is a luci_service Read_ NVRAM Direct Access…

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