CVE-2021-33839
Luca through 1.7.4 on Android allows remote attackers to obtain sensitive information about COVID...
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2021-33839- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:P/I:N/A:N - Weakness
- CWE-200
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2021-33839- Updated
- 2026-11-02
EUVDEUVD-2021-20513 No score
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.
- Record
EUVD-2021-20513- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-x4jr-cxw4-2x5h No score
Luca through 1.7.4 on Android allows remote attackers to obtain sensitive information about COVID...
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.
- Record
GHSA-x4jr-cxw4-2x5h- Weakness
- CWE-200
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-33839 is a high vulnerability (CVSS 7.5) in Luca-app Luca, published June 3, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.77%, the 86th percentile. No source names a fixed version.