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CVE-2025-9494

Viessmann Vitogate 300 OS Command Injection

8.5 High

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.

Attack profile

How easy it is to exploit

Attack vector
Adjacent network
Complexity
Low
Privileges needed
High
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

0.68%Up 0.3 points since Sep 23, 2025
90%50%10%1%

What each source reports

CVE List Score used 8.5

Viessmann Vitogate 300 OS Command Injection

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.

Record
CVE-2025-9494
CVSS 4.0
8.5 HighCVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weakness
CWE-78
Updated
2026-11-02
EUVDEUVD-2025-30434 8.5

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.

Record
EUVD-2025-30434
CVSS 4.0
8.5 HighCVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-75cp-gjjh-3r55 8.5

An OS command injection vulnerability has been discovered in the Vitogate 300, which can be...

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.

Record
GHSA-75cp-gjjh-3r55
CVSS 4.0
8.5 HighCVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness
CWE-78
Updated
2026-11-02
NVD 8.5

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.

Record
CVE-2025-9494
CVSS 4.0
8.5 HighCVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness
CWE-78
Updated
2026-11-02

Affected products

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2025-9494 is a high vulnerability (CVSS 8.5) in Viessmann Vitogate 300, published September 23, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.68%, the 52nd percentile. No source names a fixed version.

References

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