How severe is CVE-2025-55204?

CVE-2025-55204 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-55204 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-55204?

CVE-2025-55204 affects Muffon. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-55204?

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

Does CVE-2025-55204 have an EU (EUVD) identifier?

Yes. CVE-2025-55204 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-206240.

When was CVE-2025-55204 published?

CVE-2025-55204 was published on 2026-01-05 and last updated on 2026-06-17.

CVE-2025-55204

CVE-2025-55204 is a high-severity vulnerability in Muffon with a CVSS 3.x base score of 8.8. 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-79.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 1% (44th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-206240
Weakness: CWE-79
Affected product: Muffon
Published: 2026-01-05
Last modified: 2026-06-17

Description

muffon is a cross-platform music streaming client for desktop. Versions prior to 2.3.0 have a one-click Remote Code Execution (RCE) vulnerability in. An attacker can exploit this issue by embedding a specially crafted `muffon://` link on any website they control. When a victim visits the site or clicks the link, the browser triggers Muffon’s custom URL handler, causing the application to launch and process the URL. This leads to RCE on the victim's machine without further interaction. Version 2.3.0 patches the issue.

Frequently asked questions

What is CVE-2025-55204?: muffon is a cross-platform music streaming client for desktop. Versions prior to 2.3.0 have a one-click Remote Code Execution (RCE) vulnerability in. An attacker can exploit this issue by embedding a specially crafted `muffon://` link on any website they control. When a victim visits the site or clicks the link, the browser triggers Muffon’s custom URL handler, causing the application to launch and process the URL. This leads to RCE on the victim's machine without further interaction. Version 2.3.0 patches the issue.
How severe is CVE-2025-55204?: CVE-2025-55204 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-55204 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-55204?: CVE-2025-55204 affects Muffon. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-55204?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-55204 have an EU (EUVD) identifier?: Yes. CVE-2025-55204 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-206240.
When was CVE-2025-55204 published?: CVE-2025-55204 was published on 2026-01-05 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:muffon:muffon:*:*:*:*:*:node.js:*:*

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