CVE-2026-29516

Buffalo TeraStation NAS TS5400R firmware version 4.02-0.06 and prior contain an excessive file permissions vulnerability that allows authenticated attackers to read the /etc/shadow file by uploading and executing a PHP file through the webserver. Attackers can exploit world-readable permissions on /etc/shadow to retrieve hashed passwords for all configured accounts including root.

CVSS v3 4.9 MEDIUM

4.9^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.2 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required HIGH

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://buffaloamericas.com/	Product
https://www.vulncheck.com/advisories/buffalo-terastation-ts5400r-excessive-file-permissions-information-disclosure	Third Party Advisory

Configurations

Configuration 1 (hide)

AND

cpe:2.3:o:buffaloamericas:terastation_nas_ts5400r_firmware:*:*:*:*:*:*:*:*

cpe:2.3:h:buffaloamericas:terastation_nas_ts5400r:-:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-03-16 20:16

Updated : 2026-06-17 10:29

NVD link : CVE-2026-29516

Mitre link : CVE-2026-29516

CVE.ORG link : CVE-2026-29516

JSON object : View

Products Affected

buffaloamericas

terastation_nas_ts5400r
terastation_nas_ts5400r_firmware

CWE

CWE-732

Incorrect Permission Assignment for Critical Resource

{"id": "CVE-2026-29516", "cveTags": [{"tags": ["unsupported-when-assigned"], "sourceIdentifier": "disclosure@vulncheck.com"}], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-29516", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-03-16T20:08:01.485297Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 4.9, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "HIGH", "confidentialityImpact": "HIGH"}, "impactScore": 3.6, "exploitabilityScore": 1.2}], "cvssMetricV40": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 6.9, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "HIGH", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "NONE", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "disclosure@vulncheck.com", "affectedData": [{"vendor": "Buffalo", "product": "TeraStation NAS TS5400R", "versions": [{"status": "affected", "version": "0", "versionType": "custom", "lessThanOrEqual": "4.02-0.06"}], "defaultStatus": "unknown"}]}], "published": "2026-03-16T20:16:18.113", "references": [{"url": "https://buffaloamericas.com/", "tags": ["Product"], "source": "disclosure@vulncheck.com"}, {"url": "https://www.vulncheck.com/advisories/buffalo-terastation-ts5400r-excessive-file-permissions-information-disclosure", "tags": ["Third Party Advisory"], "source": "disclosure@vulncheck.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "description": [{"lang": "en", "value": "CWE-732"}]}], "descriptions": [{"lang": "en", "value": "Buffalo TeraStation NAS TS5400R firmware version 4.02-0.06 and prior contain an excessive file permissions vulnerability that allows authenticated attackers to read the /etc/shadow file by uploading and executing a PHP file through the webserver. Attackers can exploit world-readable permissions on /etc/shadow to retrieve hashed passwords for all configured accounts including root."}, {"lang": "es", "value": "La versi\u00f3n de firmware 4.02-0.06 y anteriores de Buffalo TeraStation NAS TS5400R contienen una vulnerabilidad de permisos de archivo excesivos que permite a atacantes autenticados leer el archivo / etc / shadow al cargar y ejecutar un archivo PHP a trav\u00e9s del servidor web. Los atacantes pueden explotar los permisos de lectura global en / etc / shadow para recuperar contrase\u00f1as con hash para todas las cuentas configuradas, incluyendo root."}], "lastModified": "2026-06-17T10:29:48.087", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:buffaloamericas:terastation_nas_ts5400r_firmware:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "AAA22816-3D87-4A44-842E-76D3CD7CA837", "versionEndIncluding": "4.02-0.06"}], "operator": "OR"}, {"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:h:buffaloamericas:terastation_nas_ts5400r:-:*:*:*:*:*:*:*", "vulnerable": false, "matchCriteriaId": "29B75845-6899-4E0B-BAC6-4730DA232039"}], "operator": "OR"}], "operator": "AND"}], "sourceIdentifier": "disclosure@vulncheck.com"}