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    CVE-2021-34343

    A stack buffer overflow vulnerability has been reported to affect QNAP device running QTS, QuTScloud, QuTS hero. If exploited, this vulnerability allows attackers to execute arbitrary code. We have already fixed this vulnerability in the following versions of QTS, QuTScloud, QuTS hero: QTS 4.5.4.1715 build 20210630 and later QTS 5.0.0.1716 build 20210701 and later QuTScloud c4.5.6.1755 and later QuTS hero h4.5.4.1771 build 20210825 and later

    Published:Sep 10, 2021
    Last Modified:Nov 21, 2024
    EPS:Sep 10, 2021
    EPSS Score:0.00477
    CVSS Score:6

    Affected Products

    Vendor
    Qnap
    Product
    Qts
    Vendor
    Qnap
    Product
    Quts Hero
    Vendor
    Qnap
    Product
    Qutscloud

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-787 Out-of-bounds Write

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    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