EUVD-2026-35973
GHSA-vj77-7vg3-hgxm
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/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
Primary rating from Vendor (qnap) · only source for this CVE.
CVSS VectorVendor: qnap
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/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
Lifecycle Timeline
4DescriptionCVE.org
A NULL pointer dereference vulnerability has been reported to affect File Station 6. If a remote attacker gains a user account, they can then exploit the vulnerability to launch a denial-of-service (DoS) attack.
We have already fixed the vulnerability in the following version: File Station 5 5.5.6.5208 and later
AnalysisAI
NULL pointer dereference in QNAP File Station 5 enables authenticated remote attackers to crash the service and cause a denial-of-service condition. Exploitation requires prior acquisition of a valid user account on the target QNAP NAS device, after which the attacker can trigger the dereference remotely over the network. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to first possess a valid, low-privileged user account on the target QNAP NAS system (PR:L in CVSS 4.0). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 base score of 5.3 (Medium) accurately reflects a bounded but real availability risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has obtained or socially engineered a low-privileged QNAP NAS user account authenticates to File Station 5 and sends a specially crafted network request that triggers a NULL pointer dereference in the service. The resulting process crash takes File Station offline, denying legitimate users access to the web-based file management interface until the service is restarted. … |
| Remediation | Upgrade QNAP File Station 5 to version 5.5.6.5208 or later, as confirmed by the vendor-released patch documented in QNAP security advisory QSA-26-19 (https://www.qnap.com/en/security-advisory/qsa-26-19). … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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