CVE-2020-8790: The OKLOK (3.1.1) mobile companion app for Fingerprint Bluetooth Padlock FB50 (2.3) has weak password requirem

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2020-8790 is a critical-severity flaw (CVSS 9.8) affecting oklok. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The OKLOK (3.1.1) mobile companion app for Fingerprint Bluetooth Padlock FB50 (2.3) has weak password requirements combined with improper restriction of excessive authentication attempts, which could allow a remote attacker to discover user credentials and obtain access via a brute force attack.

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	1.7% (top 23%)
CISA exploited list	No
Weakness	CWE-307, CWE-521
Published	2020-05-04
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: oklok project

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

Am I affected?

Timeline

2020-05-04 14:15 UTCPublished CVE record published
2026-06-17 03:26 UTCUpdated Record last modified

oklok project oklok DOWNGRADE

Affected: 3.1.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.1.1

1. Check installed version

apt-cache policy oklok || rpm -q oklok || oklok --version

2. No fixed release: DOWNGRADE to a release before 3.1.1 (Debian / Ubuntu)

apt-cache madison oklok sudo apt install oklok=<VERSION_BEFORE_3.1.1> sudo apt-mark hold oklok

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

dnf --showduplicates list oklok sudo dnf downgrade oklok-<VERSION_BEFORE_3.1.1> sudo dnf versionlock add oklok

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-2020-8790?

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

Is CVE-2020-8790 being exploited?

CVE-2020-8790 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-2020-8790 affect?

CVE-2020-8790 affects oklok. Severity is critical (CVSS 9.8). The OKLOK (3.1.1) mobile companion app for Fingerprint Bluetooth Padlock FB50 (2.3) has weak password requirements combined with improper restriction of excessive authentication attempts, which could allow a remote attacker to discover user

How urgent is CVE-2020-8790?

Priority 63/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Bluetooth vulnerabilities

Related CVEs

CVE-2020-8792 MEDIUM 5.3 DOWNGRADE The OKLOK (3.1.1) mobile companion app for Fingerprint Bluetooth Padlock FB50 (2.3) has an information-exposur
CVE-2020-8791 MEDIUM 6.5 DOWNGRADE The OKLOK (3.1.1) mobile companion app for Fingerprint Bluetooth Padlock FB50 (2.3) allows remote attackers to
CVE-2020-10876 HIGH 7.5 DOWNGRADE The OKLOK (3.1.1) mobile companion app for Fingerprint Bluetooth Padlock FB50 (2.3) does not correctly impleme

References

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