How severe is CVE-2025-66954?

CVE-2025-66954 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2025-66954 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-66954?

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

Does CVE-2025-66954 have an EU (EUVD) identifier?

Yes. CVE-2025-66954 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-209534.

When was CVE-2025-66954 published?

CVE-2025-66954 was published on 2026-04-20 and last updated on 2026-06-17.

CVE-2025-66954

CVE-2025-66954 is a medium-severity vulnerability with a CVSS 3.x base score of 6.5. 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-639.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (24th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-209534
Weakness: CWE-639
Published: 2026-04-20
Last modified: 2026-06-17

Description

A vulnerability exists in the Buffalo Link Station version 1.85-0.01 that allows unauthenticated or guest-level users to enumerate valid usernames and their associated privilege roles. The issue is triggered by modifying a parameter within requests sent to the /nasapi endpoint.

Frequently asked questions

What is CVE-2025-66954?: A vulnerability exists in the Buffalo Link Station version 1.85-0.01 that allows unauthenticated or guest-level users to enumerate valid usernames and their associated privilege roles. The issue is triggered by modifying a parameter within requests sent to the /nasapi endpoint.
How severe is CVE-2025-66954?: CVE-2025-66954 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2025-66954 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-66954?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-66954 have an EU (EUVD) identifier?: Yes. CVE-2025-66954 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-209534.
When was CVE-2025-66954 published?: CVE-2025-66954 was published on 2026-04-20 and last updated on 2026-06-17.

References

https://github.com/DBmonster19/CVE-2025-66954

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