Assessment
Why it matters
EPSS is 0.4%; technical severity is CVSS 6.3.
A buffer overflow vulnerability has been reported to affect File Station 5. If a remote attacker gains a user account, they can then exploit the vulnerability to modify memory or crash processes. We have already fixed the vulnerability in the following version: File Station 5 5.5.6.5208 and later
Who should care
- Teams operating File Station
- Vulnerability and exposure management teams
- Security operations teams monitoring exploitation activity
Response plan
What I would do
- Confirm whether File Station is present in the environment.
- Identify affected versions and establish whether vulnerable services are exposed or reachable.
- Review vendor guidance and identify the supported fix or mitigation.
- Review relevant security telemetry for evidence of attempted or successful exploitation.
- Document the remediation decision and track it to verified completion.
Treatment intelligence
Remediation intelligence
Vendor sources are listed before government and third-party guidance. Confirm product applicability and change prerequisites before deployment.
Verification noteNo explicit patch, upgrade, mitigation or workaround is currently recorded.
Technical details
- CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- CWE
- CWE-121
- Affected versions
- QNAP File Station (Start Including 5.5.6.4691, End Excluding 5.5.6.5208)
- Fixed versions
- QNAP File Station (Fixed from 5.5.6.5208)
- Published
- 10 June 2026
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
Signal timeline
- CVE published
- Latest EPSS score: 0.4%
- Signal calculated at 11