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

Severity: medium (CVSS 4.9 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2022-01-20 · updated 2026-06-17
Weakness: CWE-335

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.

Affected products

Telenot Electronic GmbH CompasX: before 32.0 — fixed in 32.0

How to fix

Upgrade to a fixed version: Telenot Electronic GmbH CompasX 32.0. Check the vendor advisory for mitigations.

References

https://www.x41-dsec.de/lab/advisories/x41-2021-003-telenot-complex-insecure-keygen/
https://www.x41-dsec.de/lab/advisories/x41-2021-003-telenot-complex-insecure-keygen/

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