CVE-2021-38687
highpriority · track · 39EPSS 0.013 · 71 %ileEURUUSEPSS · scored 2026-10-27
A stack buffer overflow vulnerability has been reported to affect QNAP NAS running Surveillance Station. If exploited, this vulnerability allows attackers to execute arbitrary code. We have already fixed this vulnerability in the following versions of Surveillance Station: QTS 5.0.0 (64 bit): Surveillance Station 5.2.0.4.2 ( 2021/10/26 ) and later QTS 5.0.0 (32 bit): Surveillance Station 5.2.0.3.2 ( 2021/10/26 ) and later QTS 4.3.6 (64 bit): Surveillance Station 5.1.5.4.6 ( 2021/10/26 ) and later QTS 4.3.6 (32 bit): Surveillance Station 5.1.5.3.6 ( 2021/10/26 ) and later QTS 4.3.3: Surveillance Station 5.1.5.3.6 ( 2021/10/26 ) and later
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 7.5–9.8
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (16)
Products and version ranges known to be affected.
also known as (4)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (5)
External citations — patches, advisories, analysis.
- https://www.cybersecurity-help.cz/vdb/SB2021120917cnnvd
- https://www.qnap.com.cn/en/security-advisory/qsa-21-46Patchcnnvd
- https://www.qnap.com/en/security-advisory/qsa-21-46cnnvd
- https://www.qnap.com/en/security-advisory/qsa-21-46enisa_euvd
- https://www.qnap.com/en/security-advisory/qsa-21-46Vendor Advisorynvd
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