{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-11405",
        "assignerOrgId": "37e5125f-f79b-445b-8fad-9564f167944b",
        "state": "PUBLISHED",
        "assignerShortName": "certcc",
        "dateReserved": "2026-06-05T18:12:15.445Z",
        "datePublished": "2026-07-06T19:17:07.891Z",
        "dateUpdated": "2026-07-08T13:40:24.471Z"
    },
    "containers": {
        "cna": {
            "title": "Hidden backdoor authentication mechanism in multiple versions of Tenda firmware allows admin access to web management interface",
            "descriptions": [
                {
                    "lang": "en",
                    "value": "The web server binary /bin/httpd contains a hidden backdoor authentication mechanism in the login() function at 004c88b8.\r\n\r\n- The function contains a normal authentication path using MD5/hash-based password verification (prod_encode64/PasswordToMd5/check_rand_key).\r\n- After normal authentication fails, it calls GetValue(\"sys.rzadmin.password\") to read a backdoor password from the device configuration.\r\n- It performs a direct strcmp() comparison (plaintext, not hashed) between the config value and the user-supplied password.\r\n\r\nA successful match grants role=2 (admin-level access) and creates a valid session. The rzadmin username is never checked — any username works with the backdoor"
                }
            ],
            "source": {
                "discovery": "UNKNOWN"
            },
            "affected": [
                {
                    "vendor": "Tenda",
                    "product": "firmware",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "US_AC6V2.0RTL_V15.03.06.51_multi_T"
                        }
                    ]
                },
                {
                    "vendor": "Tenda",
                    "product": "firmware",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "US_AC5V1.0RTL_V15.03.06.48_multi_TDE01"
                        }
                    ]
                },
                {
                    "vendor": "Tenda",
                    "product": "firmware",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "US_AC10V1.0re_V15.03.06.46_multi_TDE01"
                        }
                    ]
                },
                {
                    "vendor": "Tenda",
                    "product": "firmware",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "US_W15EV1.0br_V15.11.0.5(1068_1567_841)_EN_TDE"
                        }
                    ]
                },
                {
                    "vendor": "Tenda",
                    "product": "firmware",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "US_FH1201V1.0BR_V1.2.0.14(408)_EN_TD"
                        }
                    ]
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "description": "CWE-912: Hidden Functionality"
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://cwe.mitre.org/data/definitions/912.html"
                },
                {
                    "url": "https://kb.cert.org/vuls/id/213560"
                }
            ],
            "x_generator": {
                "engine": "VINCE 3.0.43",
                "env": "prod",
                "origin": "https://cveawg.mitre.org/api/cve/CVE-2026-11405"
            },
            "providerMetadata": {
                "orgId": "37e5125f-f79b-445b-8fad-9564f167944b",
                "shortName": "certcc",
                "dateUpdated": "2026-07-06T19:24:17.280Z"
            }
        },
        "adp": [
            {
                "title": "CVE Program Container",
                "references": [
                    {
                        "url": "https://www.kb.cert.org/vuls/id/213560"
                    }
                ],
                "providerMetadata": {
                    "orgId": "af854a3a-2127-422b-91ae-364da2661108",
                    "shortName": "CVE",
                    "dateUpdated": "2026-07-06T20:37:55.739Z"
                }
            },
            {
                "metrics": [
                    {
                        "cvssV3_1": {
                            "scope": "UNCHANGED",
                            "version": "3.1",
                            "baseScore": 9.8,
                            "attackVector": "NETWORK",
                            "baseSeverity": "CRITICAL",
                            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                            "integrityImpact": "HIGH",
                            "userInteraction": "NONE",
                            "attackComplexity": "LOW",
                            "availabilityImpact": "HIGH",
                            "privilegesRequired": "NONE",
                            "confidentialityImpact": "HIGH"
                        }
                    },
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-07-08T03:56:43.961536Z",
                                "id": "CVE-2026-11405",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "yes"
                                    },
                                    {
                                        "Technical Impact": "total"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-07-08T13:40:24.471Z"
                }
            }
        ]
    }
}