CVE-2021-33838

Luca through 1.7.4 on Android allows remote attackers to obtain sensitive information about COVID...

7.5 High

Luca through 1.7.4 on Android allows remote attackers to obtain sensitive information about COVID-19 tracking because requests related to Check-In State occur shortly after requests for Phone Number Registration.

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

2.77%Up 1.5 points since Jun 4, 2021

What each source reports

NVD Score used 7.5

Record: CVE-2021-33838
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS 2.0: 5.0 MediumAV:N/AC:L/Au:N/C:P/I:N/A:N
Weakness: CWE-203
Updated: 2026-11-02

CVE List No score

Record: CVE-2021-33838
Updated: 2026-11-02

EUVDEUVD-2021-20512 No score

Record: EUVD-2021-20512
Updated: 2026-11-03

GitHub AdvisoriesGHSA-p3j7-5j28-hvpx 7.5

Luca through 1.7.4 on Android allows remote attackers to obtain sensitive information about COVID...

Record: GHSA-p3j7-5j28-hvpx
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness: CWE-200
Updated: 2026-11-02

Affected products

luca-app luca

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-33838 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.