How severe is CVE-2023-5222?

CVE-2023-5222 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2023-5222 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 75% (99th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-5222?

CVE-2023-5222 affects Viessmann Vitogate 300 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-5222?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2023-5222 published?

CVE-2023-5222 was published on 2023-09-27 and last updated on 2026-06-17.

CVE-2023-5222

CVE-2023-5222 is a medium-severity vulnerability in Viessmann Vitogate 300 Firmware with a CVSS 3.x base score of 6.3. Its EPSS exploit-prediction score of 75% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-259.

Key facts

Severity: Medium (CVSS 3.x base score 6.3)
CVSS v2: 5.8
EPSS exploit prediction: 75% (99th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-259
Affected product: Viessmann Vitogate 300 Firmware
Published: 2023-09-27
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2023-5222?: 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.
How severe is CVE-2023-5222?: CVE-2023-5222 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2023-5222 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 75% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-5222?: CVE-2023-5222 affects Viessmann Vitogate 300 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-5222?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-5222 published?: CVE-2023-5222 was published on 2023-09-27 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:viessmann:vitogate_300_firmware:*:*:*:*:*:*:*:*

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