{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-71939", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-08-08T16:37:44.519Z", "datePublished": "2026-08-24T17:08:03.232Z", "dateUpdated": "2026-08-24T17:08:03.232Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-08-24T17:08:03.232Z"}, "datePublic": "2026-08-24T00:00:00.000Z", "title": "DrayTek VigorSwitch Multiple Models Buffer Overflow via acl_general_setup Add ACE", "descriptions": [{"lang": "en", "value": "Multiple DrayTek VigorSwitch models contain a buffer overflow vulnerability in the acl_general_setup Add ACE function. The vulnerability is caused by copying the name field into a fixed-size buffer without length validation. 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Exploitation requires valid administrative credentials for the device's web management interface."}], "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-120", "description": "Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')", "type": "CWE"}]}], "affected": [{"vendor": "DrayTek Corporation", "product": "VigorSwitch G2540xs", "defaultStatus": "unaffected", "versions": [{"version": "0", "lessThan": "3.9.10", "status": "affected", "versionType": "custom"}]}, {"vendor": "DrayTek Corporation", "product": "VigorSwitch P2540xs", "defaultStatus": "unaffected", "versions": [{"version": "0", "lessThan": "3.9.10", "status": "affected", "versionType": "custom"}]}, {"vendor": "DrayTek Corporation", "product": "VigorSwitch FX2120", "defaultStatus": "unaffected", "versions": [{"version": "0", "lessThan": "3.9.10", "status": "affected", "versionType": "custom"}]}, {"vendor": "DrayTek Corporation", "product": "VigorSwitch G2282x", "defaultStatus": "unaffected", 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{"name": "VulnCheck Advisory: DrayTek VigorSwitch Multiple Models Buffer Overflow via acl_general_setup Add ACE", "tags": ["third-party-advisory"], "url": "https://www.vulncheck.com/advisories/draytek-vigorswitch-multiple-models-buffer-overflow-via-acl-general-setup-add-ace"}], "credits": [{"lang": "en", "value": "Jincheng Wang (@winmt)", "type": "finder"}, {"lang": "en", "value": "Le Yu (Nanjing University of Posts and Telecommunications)", "type": "finder"}, {"lang": "en", "value": "Xiapu Luo (The Hong Kong Polytechnic University)", "type": "finder"}], "x_generator": {"engine": "vulncheck-endgame"}}}}

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"version": "0", "versionType": "custom"}]}, {"defaultStatus": "unaffected", "product": "VigorSwitch PX2060", "vendor": "DrayTek Corporation", "versions": [{"lessThan": "2.9.10", "status": "affected", "version": "0", "versionType": "custom"}]}, {"defaultStatus": "unaffected", "product": "VigorSwitch G1280", "vendor": "DrayTek Corporation", "versions": [{"lessThan": "2.9.10", "status": "affected", "version": "0", "versionType": "custom"}]}, {"defaultStatus": "unaffected", "product": "VigorSwitch P1280", "vendor": "DrayTek Corporation", "versions": [{"lessThan": "2.9.10", "status": "affected", "version": "0", "versionType": "custom"}]}, {"defaultStatus": "unaffected", "product": "VigorSwitch P1281x", "vendor": "DrayTek Corporation", "versions": [{"lessThan": "2.9.10", "status": "affected", "version": "0", "versionType": "custom"}]}, {"defaultStatus": "unaffected", "product": "VigorSwitch G1282", "vendor": "DrayTek Corporation", "versions": [{"lessThan": "2.9.10", "status": "affected", "version": "0", "versionType": "custom"}]}, {"defaultStatus": "unaffected", "product": "VigorSwitch P1282", "vendor": "DrayTek Corporation", "versions": [{"lessThan": "2.9.10", "status": "affected", "version": "0", "versionType": "custom"}]}, {"defaultStatus": "unaffected", "product": "VigorSwitch G2121", "vendor": "DrayTek Corporation", "versions": [{"lessThan": "2.9.10", "status": "affected", "version": "0", "versionType": "custom"}]}, {"defaultStatus": "unaffected", "product": "VigorSwitch P2121", "vendor": "DrayTek Corporation", "versions": [{"lessThan": "2.9.10", "status": "affected", "version": "0", "versionType": "custom"}]}, {"defaultStatus": "unaffected", "product": "VigorSwitch PQ2121x", "vendor": "DrayTek Corporation", "versions": [{"lessThan": "2.9.10", "status": "affected", "version": "0", "versionType": "custom"}]}, {"defaultStatus": "unaffected", "product": "VigorSwitch Q2121x", "vendor": "DrayTek Corporation", "versions": [{"lessThan": "2.9.10", "status": "affected", 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"version": "0", "versionType": "custom"}]}, {"defaultStatus": "unaffected", "product": "VigorSwitch P2100", "vendor": "DrayTek Corporation", "versions": [{"lessThan": "2.9.10", "status": "affected", "version": "0", "versionType": "custom"}]}, {"defaultStatus": "unaffected", "product": "VigorSwitch G2540x", "vendor": "DrayTek Corporation", "versions": [{"lessThan": "2.9.10", "status": "affected", "version": "0", "versionType": "custom"}]}, {"defaultStatus": "unaffected", "product": "VigorSwitch P2540x", "vendor": "DrayTek Corporation", "versions": [{"lessThan": "2.9.10", "status": "affected", "version": "0", "versionType": "custom"}]}], "source": "[email protected]"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Multiple DrayTek VigorSwitch models contain a buffer overflow vulnerability in the acl_general_setup Add ACE function. The vulnerability is caused by copying the name field into a fixed-size buffer without length validation. A remote attacker can trigger this vulnerability via crafted input, causing a denial of service or potentially executing arbitrary commands. Exploitation requires valid administrative credentials for the device's web management interface."}], "id": "CVE-2026-71939", "lastModified": "2026-08-24T18:17:19.280", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.2, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.2, "impactScore": 5.9, "source": "[email protected]", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.6, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "HIGH", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/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", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "[email protected]", "type": "Secondary"}]}, "published": "2026-08-24T18:17:19.280", "references": [{"source": "[email protected]", "url": "https://www.draytek.com/about/security-advisory/multiple-vulnerabilities-in-vigorswitch-series-august-2026/"}, {"source": "[email protected]", "url": "https://www.vulncheck.com/advisories/draytek-vigorswitch-multiple-models-buffer-overflow-via-acl-general-setup-add-ace"}], "sourceIdentifier": "[email protected]", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-120"}], "source": "[email protected]", "type": "Primary"}]}

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