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    CVE-2021-28798

    A relative path traversal vulnerability has been reported to affect QNAP NAS running QTS and QuTS hero. If exploited, this vulnerability allows attackers to modify files that impact system integrity. QNAP have already fixed this vulnerability in the following versions: QTS 4.5.2.1630 Build 20210406 and later QTS 4.3.6.1663 Build 20210504 and later QTS 4.3.3.1624 Build 20210416 and later QuTS hero h4.5.2.1638 Build 20210414 and later QNAP NAS running QTS 4.5.3 are not affected.

    Published:May 21, 2021
    Last Modified:Nov 21, 2024
    EPS:May 21, 2021
    EPSS Score:0.00399
    CVSS Score:8.8

    Affected Products

    Vendor
    Qnap
    Product
    Qts
    Vendor
    Qnap
    Product
    Quts Hero

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-126 Path Traversal
    CAPEC-139 Relative Path Traversal
    CAPEC-19 Embedding Scripts within Scripts
    CAPEC-441 Malicious Logic Insertion
    CAPEC-478 Modification of Windows Service Configuration
    CAPEC-479 Malicious Root Certificate
    CAPEC-502 Intent Spoof
    CAPEC-503 WebView Exposure
    CAPEC-536 Data Injected During Configuration
    CAPEC-546 Incomplete Data Deletion in a Multi-Tenant Environment
    CAPEC-550 Install New Service
    CAPEC-551 Modify Existing Service
    CAPEC-552 Install Rootkit
    CAPEC-556 Replace File Extension Handlers
    CAPEC-558 Replace Trusted Executable
    CAPEC-562 Modify Shared File
    CAPEC-563 Add Malicious File to Shared Webroot
    CAPEC-564 Run Software at Logon
    CAPEC-578 Disable Security Software
    CAPEC-64 Using Slashes and URL Encoding Combined to Bypass Validation Logic
    CAPEC-76 Manipulating Web Input to File System Calls
    CAPEC-78 Using Escaped Slashes in Alternate Encoding
    CAPEC-79 Using Slashes in Alternate Encoding

    Related CVEs

    CVE-2026-24719 (CVSS 6.1) — A command injection vulnerability has been reported to affect several QNAP operating system versions. If a rem…
    CVE-2026-24717 (CVSS 1.2) — A path traversal vulnerability has been reported to affect several QNAP operating system versions. If a remote…
    CVE-2026-24716 (CVSS 1.2) — A NULL pointer dereference vulnerability has been reported to affect several QNAP operating system versions. I…
    CVE-2026-22893 (CVSS 8.6) — A command injection vulnerability has been reported to affect several QNAP operating system versions. If a rem…
    CVE-2025-66281 (CVSS 6.9) — A NULL pointer dereference vulnerability has been reported to affect several QNAP operating system versions. T…
    CVE-2025-66280 (CVSS 5.1) — An integer overflow or wraparound vulnerability has been reported to affect several QNAP operating system vers…
    CVE-2025-66279 (CVSS 8.6) — A command injection vulnerability has been reported to affect several QNAP operating system versions. If a rem…
    CVE-2025-66273 (CVSS 8.6) — A command injection vulnerability has been reported to affect several QNAP operating system versions. If a rem…
    CVE-2025-66276 (CVSS 9.2) — QuTS hero is not affected. We have already fixed the vulnerability in the following version: QTS 5.2.7.3256 b…
    CVE-2025-62858 (CVSS 5.1) — A buffer overflow vulnerability has been reported to affect several QNAP operating system versions. If a remot…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High