Viessmann Vitogate 300 3.0.x /cgi-bin/vitogate.cgi popen form os command injection

Summaryinfo

A vulnerability, which was classified as critical, has been found in Viessmann Vitogate 300 3.0.x. The impacted element is the function popen of the file /cgi-bin/vitogate.cgi. This manipulation of the argument form causes os command injection. This vulnerability is registered as CVE-2025-9494. The attack requires access to the local network. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Viessmann Vitogate 300 3.0.x. Affected by this vulnerability is the function popen of the file /cgi-bin/vitogate.cgi. The manipulation of the argument form with an unknown input leads to a os command injection vulnerability. The CWE definition for the vulnerability is CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at corporate.carrier.com. This vulnerability is known as CVE-2025-9494 since 08/26/2025. The exploitation appears to be easy. The attack can only be done within the local network. The exploitation requires an enhanced level of successful authentication. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1202 for this issue.

Upgrading to version 3.1.0.0 eliminates this vulnerability.

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Productinfo

Vendor

• Viessmann

Name

• Vitogate 300

Version

• 3.0.x

CPE 2.3info

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CPE 2.2info

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