How severe is CVE-2023-35856?

CVE-2023-35856 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-35856 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-35856?

CVE-2023-35856 primarily affects Nintendo Mario Kart Wii. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-35856?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2023-35856 published?

CVE-2023-35856 was published on 2023-06-19 and last updated on 2026-06-17.

CVE-2023-35856

CVE-2023-35856 is a critical-severity vulnerability in Nintendo Mario Kart Wii with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-120.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (63rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-120
Affected product: Nintendo Mario Kart Wii
Published: 2023-06-19
Last modified: 2026-06-17

Description

A buffer overflow in Nintendo Mario Kart Wii RMCP01, RMCE01, RMCJ01, and RMCK01 can be exploited by a game client to execute arbitrary code on a client's machine via a crafted packet.

Frequently asked questions

What is CVE-2023-35856?: A buffer overflow in Nintendo Mario Kart Wii RMCP01, RMCE01, RMCJ01, and RMCK01 can be exploited by a game client to execute arbitrary code on a client's machine via a crafted packet.
How severe is CVE-2023-35856?: CVE-2023-35856 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-35856 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-35856?: CVE-2023-35856 primarily affects Nintendo Mario Kart Wii. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-35856?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2023-35856 published?: CVE-2023-35856 was published on 2023-06-19 and last updated on 2026-06-17.

References

https://github.com/MikeIsAStar/Mario-Kart-Wii-Remote-Code-Execution

Affected products (4)

cpe:2.3:a:nintendo:mario_kart_wii:rmce01:*:*:*:*:*:*:*
cpe:2.3:a:nintendo:mario_kart_wii:rmcj01:*:*:*:*:*:*:*
cpe:2.3:a:nintendo:mario_kart_wii:rmck01:*:*:*:*:*:*:*
cpe:2.3:a:nintendo:mario_kart_wii:rmcp01:*:*:*:*:*:*:*

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