CVE-2020-13646: In Cheetah free WiFi 5.1, the driver file (liebaonat.sys) allows local users to cause a denial of service (BSO

This month

HIGH 7.8DOWNGRADE

CVE-2020-13646 is a high-severity flaw (CVSS 7.8) affecting cheetah free wifi. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In Cheetah free WiFi 5.1, the driver file (liebaonat.sys) allows local users to cause a denial of service (BSOD) or possibly have unspecified other impact because of not validating input values from IOCtl 0x830020f8, 0x830020E0, 0x830020E4, or 0x8300210c.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 66%)
CISA exploited list	No
Weakness	CWE-20
Published	2020-06-05
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: ijinshan

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

Am I affected?

Timeline

2020-06-05 21:15 UTCPublished CVE record published
2026-06-17 02:53 UTCUpdated Record last modified

ijinshan cheetah free wifi DOWNGRADE

Affected: 5.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.1

1. Check installed version

apt-cache policy cheetah-free-wifi || rpm -q cheetah-free-wifi || cheetah-free-wifi --version

2. No fixed release: DOWNGRADE to a release before 5.1 (Debian / Ubuntu)

apt-cache madison cheetah-free-wifi sudo apt install cheetah-free-wifi=<VERSION_BEFORE_5.1> sudo apt-mark hold cheetah-free-wifi

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list cheetah-free-wifi sudo dnf downgrade cheetah-free-wifi-<VERSION_BEFORE_5.1> sudo dnf versionlock add cheetah-free-wifi

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2020-13646?

cheetah free wifi: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-13646 being exploited?

CVE-2020-13646 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-2020-13646 affect?

CVE-2020-13646 affects cheetah free wifi. Severity is high (CVSS 7.8). In Cheetah free WiFi 5.1, the driver file (liebaonat.sys) allows local users to cause a denial of service (BSOD) or possibly have unspecified other impact because of not validating input values from IOCtl 0x830020f8, 0x830020E0, 0x830020E4,

How urgent is CVE-2020-13646?

Priority 41/100. High severity; Public exploit reference

Software pages

Wi-Fi vulnerabilities

References

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