Vulnerability · CVE-2025-9495
The Vitogate 300 web interface fails to enforce proper server-side authentication and relies on frontend-based authentication controls.
Published Sep 23, 2025 · catalog updated Sep 23, 2025 · Viessmann Vitogate 300
Check if you run it
No confirmed exploitation is on record for CVE-2025-9495. EPSS is 0.24%. Act only if a listed version of Viessmann Vitogate 300 is installed.
Gaps on this record
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- High8.7
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.24%
- Remediation
- Version ranges on file
- Affected products
- vendor Viessmann Vitogate 300 1 <3.0.0.0
The Vitogate 300 web interface fails to enforce proper server-side authentication and relies on frontend-based authentication controls. This allows an attacker to simply modify HTML elements in the browser’s developer tools to bypass login restrictions. By removing specific UI elements, an attacker can reveal the hidden administration menu, giving them full control over the device.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- vendor Viessmann Vitogate 300 1 <3.0.0.01 <3.0.0.0
How to fix CVE-2025-9495
Recommended remediation
Affected version ranges suggest a fixed boundary. Verify against the vendor advisory for your release.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2025-9495. EPSS is 0.24%. Act only if a listed version of Viessmann Vitogate 300 is installed.
Which versions are affected?
Compare what you have installed with Viessmann Vitogate 300 1 <3.0.0.0 1 <3.0.0.0. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
No weakness class is stored. EPSS 0.24%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Sep 23, 2025 · EUVD
Detected
The Vitogate 300 web interface fails to enforce proper server-side authentication and relies on frontend-based authentication controls. This allows an attacker to simply modify HTML elements in the browser’s developer tools to bypass login restrictions. By removing specific UI elements, an attacker can reveal the hidden administration menu, giving them full control over the device.
Sep 23, 2025 · EUVD
Updated
The Vitogate 300 web interface fails to enforce proper server-side authentication and relies on frontend-based authentication controls. This allows an attacker to simply modify HTML elements in the browser’s developer tools to bypass login restrictions. By removing specific UI elements, an attacker can reveal the hidden administration menu, giving them full control over the device.
Sources
- CVE.orgVulnerability recordCVE-2025-9495
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2025-9495
30-day exploitation probability 0.24%
first.org - EUVDVulnerability recordEUVD-2025-30428
The Vitogate 300 web interface fails to enforce proper server-side authentication and relies on frontend-based authentication controls. This allows an attacker to simply modify HTML elements in the browser’s developer tools to bypass login restrictions. By removing specific UI el
euvd.enisa.europa.eu
References
Freshness
Last verified in this catalog Oct 23, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.