How severe is CVE-2025-53409?

CVE-2025-53409 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 none, integrity none, and availability high.

Is CVE-2025-53409 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-53409?

CVE-2025-53409 affects Qnap File Station. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-53409?

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

Does CVE-2025-53409 have an EU (EUVD) identifier?

Yes. CVE-2025-53409 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-38282.

When was CVE-2025-53409 published?

CVE-2025-53409 was published on 2025-11-07 and last updated on 2026-06-17.

CVE-2025-53409

CVE-2025-53409 is a medium-severity vulnerability in Qnap File Station 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-770.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v4: 4.9
EPSS exploit prediction: 0% (36th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-38282
Weakness: CWE-770
Affected product: Qnap File Station
Published: 2025-11-07
Last modified: 2026-06-17

Description

An allocation of resources without limits or throttling vulnerability has been reported to affect File Station 5. If a remote attacker gains a user account, they can then exploit the vulnerability to prevent other systems, applications, or processes from accessing the same type of resource. We have already fixed the vulnerability in the following version: File Station 5 5.5.6.5018 and later

Frequently asked questions

What is CVE-2025-53409?: An allocation of resources without limits or throttling vulnerability has been reported to affect File Station 5. If a remote attacker gains a user account, they can then exploit the vulnerability to prevent other systems, applications, or processes from accessing the same type of resource. We have already fixed the vulnerability in the following version: File Station 5 5.5.6.5018 and later
How severe is CVE-2025-53409?: CVE-2025-53409 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 none, integrity none, and availability high.
Is CVE-2025-53409 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-53409?: CVE-2025-53409 affects Qnap File Station. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-53409?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-53409 have an EU (EUVD) identifier?: Yes. CVE-2025-53409 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-38282.
When was CVE-2025-53409 published?: CVE-2025-53409 was published on 2025-11-07 and last updated on 2026-06-17.

References

https://www.qnap.com/en/security-advisory/qsa-25-38

Affected products (1)

cpe:2.3:a:qnap:file_station:*:*:*:*:*:*:*:*

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