Detections
Analytics

CVE-2021-33839

high

Description

Luca through 1.7.4 on Android allows remote attackers to obtain sensitive information about COVID-19 tracking because the QR code of a Public Location can be intentionally confused with the QR code of a Private Meeting.

References

https://twitter.com/patrick_hennig/status/1387738281757061125

https://github.com/mame82/misc/blob/master/luca_traceIds.md

https://youtu.be/jWyDfEB0m08

https://luca-app.de/securityoverview/properties/objectives.html

Details

Source: Mitre, NVD

Published: 2021-06-04

Updated: 2026-06-17

Risk Information

CVSS v2

Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N

Severity: Medium

CVSS v3

Base Score: 7.5

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

Severity: High

EPSS

EPSS: 0.01701