CVE-2020-35755: An issue was discovered on Libre Wireless LS9 LS1.5/p7040 devices

This week

HIGH 7.5REMOTEMITIGATE

CVE-2020-35755 is a high-severity flaw (CVSS 7.5) 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 a luci_service Read_ NVRAM Direct Access Information Leak. The luci_service deamon running on port 7777 provides a sub-category of commands for which Read_ is prepended. Commands in this category are able to directly read the contents of the device configuration NVRAM. The NVRAM contains sensitive information, such as the Wi-Fi password (in cleartext), as well as connecte

Why this priority

High 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	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.1% (top 34%)
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-2020-35755?

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

Is CVE-2020-35755 being exploited?

CVE-2020-35755 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-2020-35755 affect?

CVE-2020-35755 affects ls9 firmware. Severity is 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 Information Leak. The luci_service deamon running on port 7777 provides a sub-category of commands for which Read_ is prepe

How urgent is CVE-2020-35755?

Priority 53/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Wi-Fi vulnerabilities

Related CVEs

CVE-2020-35758 CRITICAL 9.8 MITIGATE An issue was discovered on Libre Wireless LS9 LS1.5/p7040 devices
CVE-2020-35757 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

References

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