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Medium severity6.0NVD Advisory· Published Sep 10, 2021· Updated Jun 17, 2026

CVE-2021-34343

CVE-2021-34343

Description

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

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

9
  • QNAP Systems Inc./QTSv5
    Range: unspecified
  • QNAP Systems Inc./QuTScloudv5
    Range: unspecified
  • QNAP Systems Inc./QuTS herov5
    Range: unspecified
  • Qnap/Qtsllm-fuzzy2 versions
    4.5.4.1715 build 20210630 and later, 5.0.0.1716 build 20210701 and later+ 1 more
    • (no CPE)range: 4.5.4.1715 build 20210630 and later, 5.0.0.1716 build 20210701 and later
    • cpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*range: <4.3.3.1693
  • Qnap/QuTScloudllm-fuzzy2 versions
    c4.5.6.1755 and later+ 1 more
    • (no CPE)range: c4.5.6.1755 and later
    • cpe:2.3:o:qnap:qutscloud:*:*:*:*:*:*:*:*range: <c4.5.6.1755
  • Qnap/Quts Herollm-fuzzy2 versions
    h4.5.4.1771 build 20210825 and later+ 1 more
    • (no CPE)range: h4.5.4.1771 build 20210825 and later
    • cpe:2.3:o:qnap:quts_hero:*:*:*:*:*:*:*:*range: <h4.5.4.1771

Patches

Vulnerability mechanics

References

1

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