Auth bypass in Loxone Miniserver Gen 1
CVE-2020-27488
Loxone Miniserver devices with firmware before 11.1 (aka 11.1.9.3) are unable to use an authentication method that is based on the "signature of the update package." Therefore, these devices (or attackers who are spoofing these devices) can continue to use an unauthenticated cloud service for an indeterminate time period (possibly forever). Once an individual device's firmware is updated, and authentication occurs once, the cloud service recategorizes the device so that authentication is subsequently always required, and spoofing cannot occur.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.020 (79.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 79.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.020 · newest: 0.020 · change: 0.000
Affected products
Weakness classification (CWE)
References
- iot-lab-fh-ooe.github.io/loxone_clouddns_schwachstelle/ (Exploit, Third Party Advisory)
- www.loxone.com/dede/sicherheit-cloud-dns/ (Product, Vendor Advisory)
- www.loxone.com/enen/security-cloud-dns/ (Vendor Advisory)
- iot-lab-fh-ooe.github.io/loxone_clouddns_vulnerability/ (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-27488?
- CVE-2020-27488 is a critical-severity vulnerability in Loxone Miniserver Gen 1, classified under Improper Authentication. CVSS score: 9.8/10. Published 2021-01-13.
- How severe is CVE-2020-27488?
- Critical severity. CVSS v3 base score is 9.8 out of 10.