CVE-2020-12270Public exploit

Contact-tracing interference via predictable Bluetooth identifiers

Published Apr 27, 2020 · Updated Aug 4, 2024

Insufficiently random identifiers in Bluezone 1.0.0 allow remote attackers to disrupt COVID-19 contact tracing via Bluetooth broadcasts. BluezonerIdGenerator seeds Math.seedrandom with the current timestamp, then selects six characters from a 36-character alphabet, making the identifier space predictable. An attacker must be within Bluetooth range or distribute broadcasts through nearby transmitters; the vendor disputes practical impact because contact-history comparison exposes false alerts.

CVSS severity6.5
Medium
EPSS probability1.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insufficiently random identifiers in Bluezone 1.0.0 allow remote attackers to disrupt COVID-19 contact tracing via Bluetooth broadcasts. BluezonerIdGenerator seeds Math.seedrandom with the current timestamp, then selects six characters from a 36-character alphabet, making the identifier space predictable. An attacker must be within Bluetooth range or distribute broadcasts through nearby transmitters; the vendor disputes practical impact because contact-history comparison exposes false alerts.

The record

CVE
CVE-2020-12270
Published
Apr 27, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-330, T1565.002
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 27, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

3.3NIST NVDAV:A/AC:L/Au:N/C:P/I:N/A:N
6.5NIST NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-330Use of Insufficiently Random Values
T1565.002Transmitted Data Manipulation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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