CVE-2021-33839

Public Exploit

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.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 2.09% Top 20%
Vendor Advisory luca-app.de
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://github.com/mame82/misc/blob/master/luca_traceIds.md third party advisory
https://luca-app.de/securityoverview/properties/objectives.html vendor advisory
https://youtu.be/jWyDfEB0m08 third party advisory exploit
https://twitter.com/patrick_hennig/status/1387738281757061125 third party advisory

Frequently Asked Questions

What is the severity of CVE-2021-33839?
CVE-2021-33839 has been scored as a high severity vulnerability.
How to fix CVE-2021-33839?
To fix CVE-2021-33839, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-33839 being actively exploited in the wild?
It is possible that CVE-2021-33839 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~2% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.