CVE-2025-9494

Viessmann Vitogate 300 OS Command Injection

HIGH
8.5
CVSS Score
Published: September 23, 2025 at 01:12 AM UTC
Updated: October 11, 2026 at 08:10 PM UTC
1 product affected across 1 vendorVitogate 300 Firmware

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Severity
HIGH8.5
Exploit prediction
EPSS 0.7%
SSVC
No known exploit

Description

An OS command injection vulnerability has been discovered in the Vitogate 300, which can be exploited by malicious users to compromise affected installations. Specifically, the `/cgi-bin/vitogate.cgi` endpoint is affected, when the `form` JSON parameter is set to `form-0-2`. The vulnerability stems from the fact that that function at offset 0x21c24 does not properly sanitize supplied input before interpolating it into a format string which gets passed to `popen()`. Consequently, an authenticated attacker is able to inject arbitrary OS commands and thus gain code execution on affected devices.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

1 ≤ v < 3.1.0.01
Affected range stops below 3.1.0.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.5HIGHCarrier
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-78

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