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| QNAP TS-439 Pro
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Security Grade
Calculator v1
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QNAP TS-439 Pro
Release Date: 2009-02-05 • Status:
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Security Evaluation
1. Device Security
| Criterion
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Value
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Proof
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Comment
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| Known hardware tampering
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Rare
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🔗 Proof
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Qualitative Rare: documented local USB recovery can rewrite internal DOM. Physical-access resistance judgment, not measured tampering incidence.
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| Known vulnerabilities
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Rare
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[1] 🔗 Proof
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Qualitative Rare for documented 2018 VPNFilter issue: QNAP affected-build advisory plus Talos exact-model list. No measured frequency or claim all updated units remain vulnerable.
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| Prior attacks
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Rare
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🔗 Proof
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Talos 2018 names this exact model as VPNFilter Known Affected. Rare is qualitative for one campaign; infected build and per-model counts unknown.
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| Updatability
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Rare
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🔗 Proof
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As-of2026-10-20 model API: six listed2022-2024 releases, latest4.2.6 build20240618 published2024-07-01. Qualitative Rare; not non-updatable or historical4.2.1 cadence.
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| Category Score
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Score: 2 / 3
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2. System Security
| Criterion
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Value
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Proof
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Comment
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| Authentication with other systems
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Partial
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🔗 Proof
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QTS4.2.1: optional iSCSI CHAP and Mutual CHAP; partial device-wide authentication, not universally enforced peer authentication.
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| Communications
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No encryption
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🔗 Proof
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Historical QTS4.2.1 HTTP management on port8080; optional secure login/forced HTTPS also documented. Rating is this HTTP channel, not every service or encryption capability.
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| Storage
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No encryption
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[2] 🔗 Proof
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No encryption for named internal DOM config filesystem only: official raw ext2 mount and factory-image text file. Not all secrets/partitions or a live QTS4.2.1 dump.
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| Category Score
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Score: 3 / 3
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3. User Authentication
| Criterion
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Value
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Proof
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Comment
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| Account management
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Full
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[3] 🔗 Proof
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QTS4.2.1: ordinary users/passwords/groups/folder rights; legacy Users UI has Delete. Built-in admin undeletable; no deletion test performed.
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| Authentication
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Basic
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🔗 Proof
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QTS4.2.1 username/password with configurable physical reset restoring admin password. Basic for recovery-capable scope; no remote hardcoded-backdoor claim.
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| Brute-force protection
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Exist
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🔗 Proof
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QTS4.2.1 Network Access Protection can block IPs after failed logins for a period/indefinitely. Configurable, not asserted enabled by default.
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| Event logging
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Access event logged
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🔗 Proof
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QTS4.2.1 configurable connection/file-action logging; AFP/SSH login/logout only. Start Logging required; not every protocol or factory-enabled logging.
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| Passwords
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Default/Common/Easy to guess
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🔗 Proof
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Historical QTS4.2.1 manual p28: admin/admin; physical reset also restores admin. Not a current QTS5.2 password claim.
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| Category Score
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Score: 2 / 3
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Technical Specifications
| Property
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Details
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| Operating System & App
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Historical QTS4.2.1 behavior; update cadence separately as-of2026-10-20 (Companion App: )
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| Hardware (CPU / GPU)
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CPU: • GPU:
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| Memory & Storage
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Memory: • Storage:
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| Power, Battery & Charging
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Battery: • Power: • Charging:
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| Display & Camera
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Display: • Camera:
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| Sound & Connectivity
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Sound: • Connectivity:
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| Physical (Dimensions & Mass)
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Dimensions: • Mass:
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Historical QTS4.2.1 documentary assessment, not current-device test or one observed deployment. Exact TS-439 Pro, not ProII/II+. Configurable logging/IP-block/CHAP, not default claims. VPNFilter separately dated2018; victim firmware/count unknown. Update cadence alone as-of2026-10-20, latest listed firmware2024. Date field is QNAP-authored PRNewswire announcement2009-02-05, NOT proven earliest announcement/first shipment; earlier republication date unresolved. Source: https://en.prnasia.com/releases/global/QNAP_Announces_the_World_s_First_4_Bay_Intel_Atom_based_NAS_TS_439_Pro_Turbo_NAS-17124.shtml. Storage refers to internal DOM config filesystem, not HDD AES/all flash secrets: parent independently checked original range206+hash and debugfs reading /customise.conf Model_Name=TS-439. Factory2009 image is not live QTS4.2.1; official autorun docs bridge config use. Rare is qualitative, no measured frequency. Built-in admin undeletable; Full account lifecycle concerns ordinary users. Physical judgment concerns USB internal-DOM reimaging, not measured malicious tampering.
