CVE-2020-10876: The OKLOK (3.1.1) mobile companion app for Fingerprint Bluetooth Padlock FB50 (2.3) does not correctly impleme

This week

HIGH 7.5REMOTEDOWNGRADE

CVE-2020-10876 is a high-severity flaw (CVSS 7.5) 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) does not correctly implement its timeout on the four-digit verification code that is required for resetting passwords, nor does it properly restrict excessive verification attempts. This allows an attacker to brute force the four-digit verification code in order to bypass email verification and change the password of a victim account.

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 35%)
CISA exploited list	No
Weakness	CWE-307, CWE-613
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 02:48 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-2020-10876?

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

Is CVE-2020-10876 being exploited?

CVE-2020-10876 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-2020-10876 affect?

CVE-2020-10876 affects oklok. Severity is high (CVSS 7.5). The OKLOK (3.1.1) mobile companion app for Fingerprint Bluetooth Padlock FB50 (2.3) does not correctly implement its timeout on the four-digit verification code that is required for resetting passwords, nor does it properly restrict excessi

How urgent is CVE-2020-10876?

Priority 52/100. High 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-2020-8790 CRITICAL 9.8 DOWNGRADE The OKLOK (3.1.1) mobile companion app for Fingerprint Bluetooth Padlock FB50 (2.3) has weak password requirem

References

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