CVE-2026-4961

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The manipulation of the argument PPPOEPassword leads to stack-based buffer overflow. The attack is possible to be carried out remotely. The exploit is publicly available and might be used."}, {"lang": "es", "value": "Una vulnerabilidad fue identificada en Tenda AC6 15.03.05.16. Afectada por esta vulnerabilidad es la funci\u00f3n formQuickIndex del archivo /goform/QuickIndex del componente Gestor de Solicitudes POST. La manipulaci\u00f3n del argumento PPPOEPassword conduce a desbordamiento de b\u00fafer basado en pila. El ataque es posible de llevar a cabo remotamente. El exploit est\u00e1 disponible p\u00fablicamente y podr\u00eda ser utilizado."}], "id": "CVE-2026-4961", "lastModified": "2026-10-26T00:10:00.150", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "HIGH", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "SINGLE", "availabilityImpact": "COMPLETE", "baseScore": 9.0, "confidentialityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "vectorString": "AV:N/AC:L/Au:S/C:C/I:C/A:C", "version": "2.0"}, "exploitabilityScore": 8.0, "impactScore": 10.0, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "cna@vuldb.com", "type": "Secondary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "cna@vuldb.com", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 7.4, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "PROOF_OF_CONCEPT", "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": "LOW", "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:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/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": "cna@vuldb.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-4961", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-03-27T17:25:34.468689Z", "version": "2.0.3"}}]}, "published": "2026-03-27T17:16:31.090", "references": [{"source": "cna@vuldb.com", "tags": ["Exploit", "Third Party Advisory"], "url": "https://lavender-bicycle-a5a.notion.site/Tenda-AC6-QuickIndex-32053a41781f80758e27fa4259ec80cf?source=copy_link"}, {"source": "cna@vuldb.com", "tags": ["Permissions Required", "VDB Entry"], "url": "https://vuldb.com/?ctiid.353838"}, {"source": "cna@vuldb.com", "tags": ["Third Party Advisory", "VDB Entry"], "url": "https://vuldb.com/?id.353838"}, {"source": "cna@vuldb.com", "tags": ["Third Party Advisory", "VDB Entry"], "url": "https://vuldb.com/?submit.777617"}, {"source": "cna@vuldb.com", "tags": ["Product"], "url": "https://www.tenda.com.cn/"}], "sourceIdentifier": "cna@vuldb.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-119"}, {"lang": "en", "value": "CWE-121"}], "source": "cna@vuldb.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-787"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "15.03.05.16"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "AC6", "source": "cna", "vendor": "Tenda"}, "product": "ac6", "vendor": "tenda"}], "analysis": {"en": {"generated_at": "2026-03-31T17:29:47.079024+00:00", "value": {"mitigation_remediation": ["Update the AC6 firmware to the latest version that addresses the buffer overflow.", "If an update is not available, block or restrict external access to the /goform/QuickIndex endpoint using the router\u2019s web ACL or an external firewall.", "Monitor the router\u2019s logs for abnormal POST requests targeting the QuickIndex form and investigate any suspicious activity.", "Contact Tenda support for additional mitigation guidance if needed."], "summary": {"action": "Immediate Patch", "impact": "Remote Code Execution"}, "threat_synthesis": {"affected_systems": "Tenda AC6 routers running firmware 15.03.05.16 are affected. No other firmware versions were listed as impacted. The fault exists in the POST request handling component for QuickIndex.", "description_and_impact": "The vulnerability is a stack-based buffer overflow in the formQuickIndex function of the /goform/QuickIndex POST handler. By sending a specially crafted PPPOEPassword value an attacker can overwrite return addresses on the stack, achieving arbitrary code execution on the device. The flaw is exploitable from the network without local access and an exploit is publicly available.", "risk_and_exploitability": "The CVSS score of 8.7 indicates high severity, while the EPSS of less than 1% suggests the likelihood of exploitation is low but still non-zero, and the vulnerability is not yet in the CISA KEV database. The attack vector is remote over HTTP, requiring access to the router\u2019s web interface and knowledge of the PPPOEPassword parameter. Because an exploit is publicly available, any device without a patch could be compromised if the endpoint remains exposed."}}}}, "created": "2026-03-27T20:28:13.118652+00:00", "updated": "2026-03-31T20:01:06.936193+00:00", "vendors": ["tenda", "tenda$PRODUCT$ac6"]}