How severe is CVE-2025-59366?

CVE-2025-59366 has a CVSS 4.0 base score of 9.2, rated critical severity.

Is CVE-2025-59366 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 15% (96th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-59366?

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.

Does CVE-2025-59366 have an EU (EUVD) identifier?

Yes. CVE-2025-59366 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-199586.

When was CVE-2025-59366 published?

CVE-2025-59366 was published on 2025-11-25 and last updated on 2026-06-17.

CVE-2025-59366

CVE-2025-59366 is a critical-severity vulnerability with a CVSS 4.0 base score of 9.2. Its EPSS exploit-prediction score of 15% places it in the 96th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-22.

Key facts

Severity: Critical (CVSS 4.0 base score 9.2)
EPSS exploit prediction: 15% (96th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-199586
Weakness: CWE-22
Published: 2025-11-25
Last modified: 2026-06-17

Description

An authentication-bypass vulnerability exists in AiCloud. This vulnerability can be triggered by an unintended side effect of the Samba functionality, potentially leading to allow execution of specific functions without proper authorization. Refer to the Security Update for ASUS Router Firmware section on the ASUS Security Advisory for more information.

Frequently asked questions

What is CVE-2025-59366?: An authentication-bypass vulnerability exists in AiCloud. This vulnerability can be triggered by an unintended side effect of the Samba functionality, potentially leading to allow execution of specific functions without proper authorization. Refer to the Security Update for ASUS Router Firmware section on the ASUS Security Advisory for more information.
How severe is CVE-2025-59366?: CVE-2025-59366 has a CVSS 4.0 base score of 9.2, rated critical severity.
Is CVE-2025-59366 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 15% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-59366?: 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.
Does CVE-2025-59366 have an EU (EUVD) identifier?: Yes. CVE-2025-59366 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-199586.
When was CVE-2025-59366 published?: CVE-2025-59366 was published on 2025-11-25 and last updated on 2026-06-17.

References

https://www.asus.com/content/security-advisory/

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