# Viessmann Vitogate 300 command injection and auth bypass

Published: 2025-09-23 · Severity: routine · Sectors: infrastructure
Canonical: https://vorant.io/reports/ccda0e5e-cf44-54a5-8416-7043aff3cdde/viessmann-vitogate-300-command-injection-and-auth-bypass

> Two vulnerabilities in Vitogate 300 heating controllers allow command injection and client-side security bypass; upgrade to 3.1.0.1.

Viessmann Vitogate 300, a gateway device used in commercial building climate control systems, contains two vulnerabilities affecting all versions prior to 3.1.0.1. CVE-2025-9494 is an OS command injection flaw (CWE-78) that allows an attacker with high privileges and adjacent network access to modify OS commands sent to downstream components, potentially achieving code execution with high impact on confidentiality, integrity and availability. CVE-2025-9495 is a client-side security enforcement bypass (CWE-602) that allows an unauthenticated attacker on the adjacent network to bypass client-side protections and cause unexpected interactions between client and server, also with high confidentiality, integrity and availability impact.

Neither vulnerability is remotely exploitable; both require adjacent network access, meaning the attacker must be on the same local network segment as the device. No public exploitation has been reported to CISA. The vulnerabilities are resolved in version 3.1.0.1. Vitogate 300 is deployed worldwide in commercial facilities such as office buildings and shopping centers. Viessmann is headquartered in Germany and the device is used in building automation and climate control infrastructure.

## Mentioned in this report

- Vulnerabilities: CVE-2025-9494, CVE-2025-9495

Source reporting: https://www.cisa.gov/news-events/ics-advisories/icsa-25-266-04

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