CVE-2021-33839 json
Luca through 1.7.4 on Android allows remote attackers to obtain sensitive information about COVID-19 tracking because the QR code of a Publ…
published 2021-06-03 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-20513
- cvss
- 7.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.8%
- EPSS 2.8% chance of exploitation in 30 days, percentile 86%
- public exploits
- 0
- none known
Summary
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.
Exploit prediction
2.77% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- youtu.be https://youtu.be/jWyDfEB0m08 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:P/I:N/A:N |
Classification
- Weakness
-
- CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
References
-
youtu.be
/jWyDfEB0m08
exploit, third-party-advisory
-
luca-app.de
/securityoverview/properties/objectives.html
vendor-advisory
-
github.com
/mame82/misc/blob/master/luca_traceIds.md
third-party-advisory
-
twitter.com
/patrick_hennig/status/1387738281757061125
third-party-advisory
Sources
- CVE List CVE-2021-33839
- NVD CVE-2021-33839
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.