# CVE-2023-5222

## Summary

- **CVE ID:** CVE-2023-5222
- **Severity:** MEDIUM
- **CVSS Score:** 6.3 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L)
- **CWE:** CWE-259
- **Published:** Sep 27, 2023
- **Last Modified:** Mar 13, 2026

## Description

A vulnerability classified as critical was found in Viessmann Vitogate 300 up to 2.1.3.0. This vulnerability affects the function isValidUser of the file /cgi-bin/vitogate.cgi of the component Web Management Interface. The manipulation leads to use of hard-coded password. The exploit has been disclosed to the public and may be used. The identifier of this vulnerability is VDB-240364. NOTE: The vendor was contacted early about this disclosure but did not respond in any way.

## Affected Products

- Viessmann — Vitogate 300 (2.1.0)
- Viessmann — Vitogate 300 (2.1.1)
- Viessmann — Vitogate 300 (2.1.2)
- Viessmann — Vitogate 300 (2.1.3)

## References

- [CNA](https://vuldb.com/?id.240364)
- [CNA](https://vuldb.com/?ctiid.240364)
- [CNA](https://github.com/Push3AX/vul/blob/main/viessmann/Vitogate300_HardcodedPassword.md)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 89.71%
- **EPSS Percentile:** 99.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._