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CVE-2025-9495

Viessmann Vitogate 300 Authentication Bypass

HIGH
8.7
CVSS Score
Published: September 23, 2025 at 01:16 AM UTC
Updated: October 11, 2026 at 08:10 PM UTC
1 product affected across 1 vendorVitogate 300 Firmware

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Severity
HIGH8.7
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

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.

Affected

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

Vitogate 300 Firmware· Viessmann
90%
1 ≤ v < 3.0.0.01
Affected range stops below 3.0.0.0, 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.

References (1)

Source: cverecord
https://https://www.corporate.carrier.com/product-security/advisories-resources/

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

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

CVSS

8.7HIGHCarrier
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-602

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