CVE-2026-5021

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Remote exploitation of the attack is possible. The exploit has been published and may be used."}, {"lang": "es", "value": "Se ha encontrado un fallo en Tenda F453 1.0.0.3. Esto afecta a la funci\u00f3n fromPPTPUserSetting del archivo /goform/PPTPUserSetting del componente httpd. Esta manipulaci\u00f3n del argumento delno causa desbordamiento de b\u00fafer basado en pila. Es posible la explotaci\u00f3n remota del ataque. El exploit ha sido publicado y puede ser utilizado."}], "id": "CVE-2026-5021", "lastModified": "2026-06-17T10:58:17.253", "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-2026-5021", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-03-30T14:32:11.202697Z", "version": "2.0.3"}}]}, "published": "2026-03-29T02:16:17.377", "references": [{"source": "cna@vuldb.com", "tags": ["Exploit", "Third Party Advisory"], "url": "https://github.com/Litengzheng/vul_db/blob/main/F453/vul_92/README.md"}, {"source": "cna@vuldb.com", "tags": ["Third Party Advisory", "VDB Entry"], "url": "https://vuldb.com/submit/778415"}, {"source": "cna@vuldb.com", "tags": ["Third Party Advisory", "VDB Entry"], "url": "https://vuldb.com/vuln/353906"}, {"source": "cna@vuldb.com", "tags": ["Permissions Required", "VDB Entry"], "url": "https://vuldb.com/vuln/353906/cti"}, {"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": "1.0.0.3"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "F453", "source": "cna", "vendor": "Tenda"}, "product": "f453", "vendor": "tenda"}], "analysis": {"en": {"generated_at": "2026-03-30T20:38:54.629003+00:00", "value": {"mitigation_remediation": ["Acquire the latest firmware from Tenda\u2019s official website and install it on the affected router.", "If a patched firmware is unavailable, remove or disable the PPTP configuration feature via the router\u2019s administration interface, or block access to /goform/PPTPUserSetting.", "Place the router behind a firewall and restrict inbound access to the HTTP management interface to trusted IP addresses.", "Regularly monitor router logs for anomalous POST requests to /goform/PPTPUserSetting or signs of buffer\u2011overflow attempts.", "Keep other network devices and services up to date to reduce the impact in case an attacker gains remote code execution on the router."], "summary": {"action": "Immediate patch", "impact": "Remote code execution via stack overflow"}, "threat_synthesis": {"affected_systems": "Tenda F453 routers running firmware 1.0.0.3 are affected. Only this firmware revision is documented as vulnerable. The flaw resides in the httpd component handling PPTP user settings, accessed through the router\u2019s web interface.", "description_and_impact": "A stack-based buffer overflow exists in the PPTPUserSetting function of Tenda F453 router firmware 1.0.0.3. By manipulating the delno parameter in the web form /goform/PPTPUserSetting, an attacker can overwrite the stack, potentially hijacking execution flow and achieving remote code execution. The vulnerability stems from unchecked input handling and is related to CWE-119, CWE-121 and CWE-787.", "risk_and_exploitability": "The CVSS score is 8.7, indicating high severity, while the EPSS score is below 1%, suggesting low current exploitation probability. However, publicly available exploits exist, meaning the risk is not negligible. The vulnerability is not listed in the KEV catalog. Attackers can exploit the flaw remotely without authentication via the router\u2019s web interface, potentially executing arbitrary code on the device and compromising network traffic."}}}}, "created": "2026-03-29T20:31:51.355102+00:00", "updated": "2026-03-30T20:56:56.534343+00:00", "vendors": ["tenda", "tenda$PRODUCT$f453"]}