CVE-2021-38687

Stack Overflow Vulnerability in Surveillance Station

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Published Dec 29, 2021 CVSS 3.1 · 8.1 High EPSS 1.3% KEV · Not listed

Description

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

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

QNAP Systems Inc.

Surveillance Station

affected

Version	Status	Constraints
`unspecified`	affected	< 5.2.0.4.2 ( 2021/10/26 )

QNAP Systems Inc.

Surveillance Station

affected

Version	Status	Constraints
`unspecified`	affected	< 5.2.0.3.2 ( 2021/10/26 )

QNAP Systems Inc.

Surveillance Station

affected

Version	Status	Constraints
`unspecified`	affected	< 5.1.5.4.6 ( 2021/10/26 )

QNAP Systems Inc.

Surveillance Station

affected

Version	Status	Constraints
`unspecified`	affected	< 5.1.5.3.6 ( 2021/10/26 )

QNAP Systems Inc.

Surveillance Station

affected

Version	Status	Constraints
`unspecified`	affected	< 5.1.5.3.6 ( 2021/10/26 )

Configuration 1 [-]

AND

cpe:2.3:a:qnap:surveillance_station:*:*:*:*:*:*:*:*

cpe:2.3:o:qnap:qts:5.0.0:*:*:*:*:*:x64:*

Configuration 2 [-]

AND

cpe:2.3:a:qnap:surveillance_station:*:*:*:*:*:*:*:*

cpe:2.3:o:qnap:qts:5.0.0:*:*:*:*:*:x86:*

Configuration 3 [-]

AND

cpe:2.3:a:qnap:surveillance_station:*:*:*:*:*:*:*:*

cpe:2.3:o:qnap:qts:4.3.6:*:*:*:*:*:x64:*

Configuration 4 [-]

AND

cpe:2.3:a:qnap:surveillance_station:*:*:*:*:*:*:*:*

cpe:2.3:o:qnap:qts:4.3.6:*:*:*:*:*:x86:*

Configuration 5 [-]

AND

cpe:2.3:a:qnap:surveillance_station:*:*:*:*:*:*:*:*

cpe:2.3:o:qnap:qts:4.3.3:*:*:*:*:*:*:*

No data.

No data available yet.

Remediation

Vendor Solution

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 (32 bit): Surveillance Station 5.1.5.3.6 ( 2021/10/26 ) and later

Tracking

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Advisories

Source	ID	Title
EUVD	EUVD-2021-25126	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

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

Access Vector Network

Access Complexity Low

Authentication None

Confidentiality Impact Partial

Integrity Impact Partial

Availability Impact Partial

This CVE is not in the KEV list.

Exploit prediction score: 1.3% (1.323% probability within 30 days)

Key SSVC decision points have not yet been added.

References

Link	Providers
https://www.qnap.com/en/security-advisory/qsa-21-46

History

No history.

Subscriptions

Qnap Qts Surveillance Station

Weaknesses

CWE-120

Sources

CVE record Updated: Sep 16, 2024, 8:22 PM

Status: PUBLISHED
Assigner: qnap
Published: Dec 29, 2021, 1:05 PM
Updated: Sep 16, 2024, 8:22 PM
Reserved: Aug 13, 2021, 12:00 AM

View source JSON

Vulnrichment No data

No data.

NVD Updated: Jun 17, 2026, 4:02 AM

Status: Modified
Published: Dec 29, 2021, 1:15 PM
Modified: Jun 17, 2026, 4:02 AM

View source JSON

Red Hat No data

No data.

OpenCVE enrichment No data

No data.

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Ya hemos solucionado esta vulnerabilidad en las siguientes versiones de Surveillance Station: QTS versiones 5.0.0 (64 bits): Surveillance Station versiones 5.2.0.4.2 (26/10/2021) y posteriores QTS versiones 5.0.0 (32 bits): Surveillance Station versiones 5.2.0.3.2 (26/10/2021) y posteriores QTS versiones 4.3.6 (64 bits): Surveillance Station versiones 5.1.5.4.6 (26/10/2021) y posteriores QTS versiones 4.3.6 (32 bits): Surveillance Station versiones 5.1.5.3.6 (26/10/2021) y posteriores QTS versiones 4.3.3: Surveillance Station versiones 5.1.5.3.6 (26/10/2021) y posteriores"}], "id": "CVE-2021-38687", "lastModified": "2026-06-17T04:02:35.407", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "HIGH", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 7.5, "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 6.4, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 5.9, "source": "security@qnapsecurity.com.tw", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-12-29T13:15:08.033", "references": [{"source": "security@qnapsecurity.com.tw", "tags": ["Vendor Advisory"], "url": "https://www.qnap.com/en/security-advisory/qsa-21-46"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://www.qnap.com/en/security-advisory/qsa-21-46"}], "sourceIdentifier": "security@qnapsecurity.com.tw", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-120"}], "source": "security@qnapsecurity.com.tw", "type": "Secondary"}]}