CVE-2019-13143: An HTTP parameter pollution issue was discovered on Shenzhen Dragon Brothers Fingerprint Bluetooth Round Padlo

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CRITICAL 9.8REMOTEMITIGATE

CVE-2019-13143 is a critical-severity flaw (CVSS 9.8) affecting fb50 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An HTTP parameter pollution issue was discovered on Shenzhen Dragon Brothers Fingerprint Bluetooth Round Padlock FB50 2.3. With the user ID, user name, and the lock's MAC address, anyone can unbind the existing owner of the lock, and bind themselves instead. This leads to complete takeover of the lock. The user ID, name, and MAC address are trivially obtained from APIs found within the Android or iOS application. With only the MAC address of the

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	3.1% (top 12%)
CISA exploited list	No
Weakness	CWE-20
Published	2019-08-06
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: shenzhen dragon brothers

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

Am I affected?

Timeline

2019-08-06 18:15 UTCPublished CVE record published
2026-06-17 02:16 UTCUpdated Record last modified

shenzhen dragon brothers fb50 firmware MITIGATE

Affected: 2.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.3

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-2019-13143?

fb50 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-13143 being exploited?

CVE-2019-13143 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-2019-13143 affect?

CVE-2019-13143 affects fb50 firmware. Severity is critical (CVSS 9.8). An HTTP parameter pollution issue was discovered on Shenzhen Dragon Brothers Fingerprint Bluetooth Round Padlock FB50 2.3. With the user ID, user name, and the lock's MAC address, anyone can unbind the existing owner of the lock, and bind t

How urgent is CVE-2019-13143?

Priority 66/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Android vulnerabilities · iOS vulnerabilities · Bluetooth vulnerabilities

References

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