CVE-2020-12857

Device re-identification via stale cached TempID

Published May 18, 2020 · Updated Aug 4, 2024

Information disclosure in COVIDSafe 1.0.15 and 1.0.16 allows remote attackers to re-identify Android devices via Bluetooth GATT. The GATT server retains its cached read payload after an interrupted handshake and returns the same TempID on later reads instead of rotating it. Any nearby Bluetooth client can deliberately break each handshake and correlate the stable identifier for the lifetime of the app instance.

CVSS severity7.5
High
EPSS probability1.63%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in COVIDSafe 1.0.15 and 1.0.16 allows remote attackers to re-identify Android devices via Bluetooth GATT. The GATT server retains its cached read payload after an interrupted handshake and returns the same TempID on later reads instead of rotating it. Any nearby Bluetooth client can deliberately break each handshake and correlate the stable identifier for the lifetime of the app instance.

The record

CVE
CVE-2020-12857
Published
May 18, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-459
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 18, 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

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:P/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-459Incomplete Cleanup

Public exploit references

No public exploit references are available in this record.

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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