CVE-2020-12270: React Native Bluetooth Scan in Bluezone 1.0.0 uses six-character alphanumeric IDs, which might make it easier

This month

MEDIUM 6.5DOWNGRADE

CVE-2020-12270 is a medium-severity flaw (CVSS 6.5) affecting bluezone. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 recipien

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.4% (top 27%)
CISA exploited list	No
Weakness	CWE-330
Published	2020-04-27
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: bluezone

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

Am I affected?

Timeline

2020-04-27 04:15 UTCPublished CVE record published
2026-06-17 02:51 UTCUpdated Record last modified

bluezone bluezone DOWNGRADE

Affected: 1.0.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.0.0 (Debian / Ubuntu)

apt-cache madison bluezone sudo apt install bluezone=<VERSION_BEFORE_1.0.0> sudo apt-mark hold bluezone

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

dnf --showduplicates list bluezone sudo dnf downgrade bluezone-<VERSION_BEFORE_1.0.0> sudo dnf versionlock add bluezone

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-2020-12270?

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

Is CVE-2020-12270 being exploited?

CVE-2020-12270 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-2020-12270 affect?

CVE-2020-12270 affects bluezone. Severity is medium (CVSS 6.5). 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

How urgent is CVE-2020-12270?

Priority 46/100. Public exploit reference

Software pages

React vulnerabilities · Bluetooth vulnerabilities

References

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