CVE-2020-12270

Name: CVE-2020-12270
Creator: NVD / NIST
Published: 2020-04-27T04:15:10.443+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.43%

Last modified Jun 17, 2026

CVE-2020-12270 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. React Native Bluetooth Scan in Bluezone 1.0.0 uses six-character alphanumeric IDs, which might make it easier for remote attackers to interfere with COVID-19 contact tracing by using many IDs. NOTE: the vendor disputes the relevance of this report because the recipient of an F1 alert will know it was a false alert if contact-history comparison fails (i.e., an F0 is not actually part of the contact history obtained from the device of this recipient, or this recipient is not actually part of the contact history obtained from the device of an F0). EPSS estimates a 1.43% chance of exploitation in the next 30 days.

Description

React Native Bluetooth Scan in Bluezone 1.0.0 uses six-character alphanumeric IDs, which might make it easier for remote attackers to interfere with COVID-19 contact tracing by using many IDs. NOTE: the vendor disputes the relevance of this report because the recipient of an F1 alert will know it was a false alert if contact-history comparison fails (i.e., an F0 is not actually part of the contact history obtained from the device of this recipient, or this recipient is not actually part of the contact history obtained from the device of an F0)

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

1.43%

69.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-330

Affected Software

Vendor	Product	Versions
Bluezone	Bluezone	1.0.0

References

https://bluezone.ai/CVE
https://github.com/BluezoneGlobal/bluezone-app/blob/afa15fcec391f0edc51d0486a4ca84dd2520bbb3/CHANGELOG.mdRelease Notes, Third Party Advisory
https://github.com/BluezoneGlobal/bluezone-app/blob/afa15fcec391f0edc51d0486a4ca84dd2520bbb3/package.json#L27Third Party Advisory
https://github.com/BluezoneGlobal/react-native-bluetooth-scan/blob/d9ee70fd594093a30e50b6e62a7593a8397c2dab/lib/android/src/main/AndroidManifest.xml#L11-L12Third Party Advisory
https://github.com/BluezoneGlobal/react-native-bluetooth-scan/blob/d9ee70fd594093a30e50b6e62a7593a8397c2dab/lib/android/src/main/java/com/scan/BluezonerIdGenerator.java#L18-L28Third Party Advisory
https://github.com/BluezoneGlobal/react-native-bluetooth-scan/blob/d9ee70fd594093a30e50b6e62a7593a8397c2dab/lib/android/src/main/java/com/scan/TraceCovidModule.java#L98Third Party Advisory
https://vnhacker.blogspot.com/2020/04/vietnams-contact-tracing-app_26.htmlExploit, Third Party Advisory
https://bluezone.ai/CVE
https://github.com/BluezoneGlobal/bluezone-app/blob/afa15fcec391f0edc51d0486a4ca84dd2520bbb3/CHANGELOG.mdRelease Notes, Third Party Advisory
https://github.com/BluezoneGlobal/bluezone-app/blob/afa15fcec391f0edc51d0486a4ca84dd2520bbb3/package.json#L27Third Party Advisory
https://github.com/BluezoneGlobal/react-native-bluetooth-scan/blob/d9ee70fd594093a30e50b6e62a7593a8397c2dab/lib/android/src/main/AndroidManifest.xml#L11-L12Third Party Advisory
https://github.com/BluezoneGlobal/react-native-bluetooth-scan/blob/d9ee70fd594093a30e50b6e62a7593a8397c2dab/lib/android/src/main/java/com/scan/BluezonerIdGenerator.java#L18-L28Third Party Advisory
https://github.com/BluezoneGlobal/react-native-bluetooth-scan/blob/d9ee70fd594093a30e50b6e62a7593a8397c2dab/lib/android/src/main/java/com/scan/TraceCovidModule.java#L98Third Party Advisory
https://vnhacker.blogspot.com/2020/04/vietnams-contact-tracing-app_26.htmlExploit, Third Party Advisory

Timeline

Published: Apr 27, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-12270?

How severe is CVE-2020-12270?

CVE-2020-12270 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.43% probability of exploitation in the next 30 days.

How do I fix CVE-2020-12270?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-12270?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST