CVE-2026-42373

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-42373", "assignerOrgId": "33c584b5-0579-4c06-b2a0-8d8329fcab9c", "state": "PUBLISHED", "assignerShortName": "securin", "dateReserved": "2026-04-27T06:21:56.901Z", "datePublished": "2026-05-04T15:57:31.057Z", "dateUpdated": "2026-05-05T12:43:39.653Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "33c584b5-0579-4c06-b2a0-8d8329fcab9c", "shortName": "securin", "dateUpdated": "2026-05-04T15:57:31.057Z"}, "title": "D-Link DIR-605L B2 Hardcoded Telnet Backdoor Credentials", "datePublic": "2026-04-24T00:00:00.000Z", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-798", "description": "CWE-798 Use of Hard-coded Credentials", "type": "CWE"}]}], "affected": [{"vendor": "D-Link", "product": "DIR-605L Firmware", "platforms": ["MIPS32 Big-Endian"], "versions": [{"status": "affected", "version": "B2", "versionType": "custom"}], "defaultStatus": "affected", "cpes": ["cpe:2.3:o:dlink:dir-605l_firmware:*:*:*:*:*:*:*:*"]}], "descriptions": [{"lang": "en", "value": "D-Link DIR-605L Hardware Revision B2 (End-of-Life, EOL) contains a hardcoded telnet backdoor. The device starts a telnet daemon at boot via /bin/telnetd.sh with the username \"Alphanetworks\" and the static password \"wrgn76_dlwbr_dir605L\" read from /etc/alpha_config/image_sign. The custom telnetd binary accepts a -u user:password flag, and the custom login binary uses strcmp() to validate credentials. Successful authentication grants an unauthenticated attacker on the local network a root shell with full administrative control. The device has reached End-of-Life (EOL) and will not receive patches.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>D-Link DIR-605L Hardware Revision B2 (End-of-Life, EOL) contains a hardcoded telnet backdoor. The device starts a telnet daemon at boot via /bin/telnetd.sh with the username \"Alphanetworks\" and the static password \"wrgn76_dlwbr_dir605L\" read from /etc/alpha_config/image_sign. The custom telnetd binary accepts a -u user:password flag, and the custom login binary uses strcmp() to validate credentials. Successful authentication grants an unauthenticated attacker on the local network a root shell with full administrative control. The device has reached End-of-Life (EOL) and will not receive patches.</p>"}]}], "tags": ["unsupported-when-assigned"], "references": [{"url": "https://www.securin.io/zero-day/cve-2026-42373-hardcoded-telnet-backdoor-in-d-link-dir-605l-b2-end-of-life-", "name": "D-Link DIR-605L B2 Hardcoded Telnet Backdoor - Securin Advisory"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH", "baseSeverity": "CRITICAL", "baseScore": 9.8, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}}], "workarounds": [{"lang": "en", "value": "This product is End-of-Life (EOL) and will NOT receive patches. Users should replace the device. Temporary: connect via backdoor and run \"killall telnetd\" and \"iptables -A INPUT -p tcp --dport 23 -j DROP\" (lost on reboot).", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>This product is End-of-Life (EOL) and will NOT receive patches. Users should replace the device. Temporary: connect via backdoor and run \"killall telnetd\" and \"iptables -A INPUT -p tcp --dport 23 -j DROP\" (lost on reboot).</p>"}]}], "credits": [{"lang": "en", "value": "Arjun Basnet from Securin Labs", "type": "finder"}], "source": {"discovery": "EXTERNAL"}, "x_generator": {"engine": "Vulnogram 1.0.2"}}, "adp": [{"references": [{"url": "https://www.securin.io/zero-day/cve-2026-42373-hardcoded-telnet-backdoor-in-d-link-dir-605l-b2-end-of-life-", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-05-05T03:56:23.980105Z", "id": "CVE-2026-42373", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"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": "2026-05-05T12:43:39.653Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-42373", "role": "CISA Coordinator", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-05-05T03:56:23.980105Z"}}}], "references": [{"url": "https://www.securin.io/zero-day/cve-2026-42373-hardcoded-telnet-backdoor-in-d-link-dir-605l-b2-end-of-life-", "tags": ["exploit"]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-04T16:34:26.999Z"}}], "cna": {"tags": ["unsupported-when-assigned"], "title": "D-Link DIR-605L B2 Hardcoded Telnet Backdoor Credentials", "source": {"discovery": "EXTERNAL"}, "credits": [{"lang": "en", "type": "finder", "value": "Arjun Basnet from Securin Labs"}], "metrics": [{"format": "CVSS", "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"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"cpes": ["cpe:2.3:o:dlink:dir-605l_firmware:*:*:*:*:*:*:*:*"], "vendor": "D-Link", "product": "DIR-605L Firmware", "versions": [{"status": "affected", "version": "B2", "versionType": "custom"}], "platforms": ["MIPS32 Big-Endian"], "defaultStatus": "affected"}], "datePublic": "2026-04-24T00:00:00.000Z", "references": [{"url": "https://www.securin.io/zero-day/cve-2026-42373-hardcoded-telnet-backdoor-in-d-link-dir-605l-b2-end-of-life-", "name": "D-Link DIR-605L B2 Hardcoded Telnet Backdoor - Securin Advisory"}], "workarounds": [{"lang": "en", "value": "This product is End-of-Life (EOL) and will NOT receive patches. Users should replace the device. Temporary: connect via backdoor and run \"killall telnetd\" and \"iptables -A INPUT -p tcp --dport 23 -j DROP\" (lost on reboot).", "supportingMedia": [{"type": "text/html", "value": "<p>This product is End-of-Life (EOL) and will NOT receive patches. Users should replace the device. Temporary: connect via backdoor and run \"killall telnetd\" and \"iptables -A INPUT -p tcp --dport 23 -j DROP\" (lost on reboot).</p>", "base64": false}]}], "x_generator": {"engine": "Vulnogram 1.0.2"}, "descriptions": [{"lang": "en", "value": "D-Link DIR-605L Hardware Revision B2 (End-of-Life, EOL) contains a hardcoded telnet backdoor. The device starts a telnet daemon at boot via /bin/telnetd.sh with the username \"Alphanetworks\" and the static password \"wrgn76_dlwbr_dir605L\" read from /etc/alpha_config/image_sign. The custom telnetd binary accepts a -u user:password flag, and the custom login binary uses strcmp() to validate credentials. Successful authentication grants an unauthenticated attacker on the local network a root shell with full administrative control. The device has reached End-of-Life (EOL) and will not receive patches.", "supportingMedia": [{"type": "text/html", "value": "<p>D-Link DIR-605L Hardware Revision B2 (End-of-Life, EOL) contains a hardcoded telnet backdoor. The device starts a telnet daemon at boot via /bin/telnetd.sh with the username \"Alphanetworks\" and the static password \"wrgn76_dlwbr_dir605L\" read from /etc/alpha_config/image_sign. The custom telnetd binary accepts a -u user:password flag, and the custom login binary uses strcmp() to validate credentials. Successful authentication grants an unauthenticated attacker on the local network a root shell with full administrative control. The device has reached End-of-Life (EOL) and will not receive patches.</p>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-798", "description": "CWE-798 Use of Hard-coded Credentials"}]}], "providerMetadata": {"orgId": "33c584b5-0579-4c06-b2a0-8d8329fcab9c", "shortName": "securin", "dateUpdated": "2026-05-04T15:57:31.057Z"}}}, "cveMetadata": {"cveId": "CVE-2026-42373", "state": "PUBLISHED", "dateUpdated": "2026-05-05T12:43:39.653Z", "dateReserved": "2026-04-27T06:21:56.901Z", "assignerOrgId": "33c584b5-0579-4c06-b2a0-8d8329fcab9c", "datePublished": "2026-05-04T15:57:31.057Z", "assignerShortName": "securin"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"cpes": ["cpe:2.3:o:dlink:dir-605l_firmware:*:*:*:*:*:*:*:*"], "defaultStatus": "affected", "platforms": ["MIPS32 Big-Endian"], "product": "DIR-605L Firmware", "vendor": "D-Link", "versions": [{"status": "affected", "version": "B2", "versionType": "custom"}]}], "source": "33c584b5-0579-4c06-b2a0-8d8329fcab9c"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:dlink:dir-605l_firmware:*:*:*:*:*:*:*:*", "matchCriteriaId": "38A73373-86B3-4DDC-A880-A66D29C7176F", "vulnerable": true}], "negate": false, "operator": "OR"}, {"cpeMatch": [{"criteria": "cpe:2.3:h:dlink:dir-605l:b2:*:*:*:*:*:*:*", "matchCriteriaId": "D096BA86-3FCB-4F16-89CA-3A2A152C88B9", "vulnerable": false}], "negate": false, "operator": "OR"}], "operator": "AND"}], "cveTags": [{"sourceIdentifier": "33c584b5-0579-4c06-b2a0-8d8329fcab9c", "tags": ["unsupported-when-assigned"]}], "descriptions": [{"lang": "en", "value": "D-Link DIR-605L Hardware Revision B2 (End-of-Life, EOL) contains a hardcoded telnet backdoor. The device starts a telnet daemon at boot via /bin/telnetd.sh with the username \"Alphanetworks\" and the static password \"wrgn76_dlwbr_dir605L\" read from /etc/alpha_config/image_sign. The custom telnetd binary accepts a -u user:password flag, and the custom login binary uses strcmp() to validate credentials. Successful authentication grants an unauthenticated attacker on the local network a root shell with full administrative control. The device has reached End-of-Life (EOL) and will not receive patches."}, {"lang": "es", "value": "D-Link DIR-605L Revisi\u00f3n de Hardware B2 (Fin de Vida \u00datil, EOL) contiene una puerta trasera telnet codificada de forma fija. El dispositivo inicia un demonio telnet al arrancar a trav\u00e9s de /bin/telnetd.sh con el nombre de usuario \u2019Alphanetworks\u2019 y la contrase\u00f1a est\u00e1tica \u2019wrgn76_dlwbr_dir605L\u2019 le\u00edda de /etc/alpha_config/image_sign. El binario telnetd personalizado acepta un indicador -u usuario:contrase\u00f1a, y el binario de inicio de sesi\u00f3n personalizado utiliza strcmp() para validar las credenciales. La autenticaci\u00f3n exitosa otorga a un atacante no autenticado en la red local un shell de root con control administrativo total. El dispositivo ha alcanzado el Fin de Vida \u00datil (EOL) y no recibir\u00e1 parches."}], "id": "CVE-2026-42373", "lastModified": "2026-10-25T23:10:00.167", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "33c584b5-0579-4c06-b2a0-8d8329fcab9c", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-42373", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-05-05T03:56:23.980105Z", "version": "2.0.3"}}]}, "published": "2026-05-04T17:16:25.527", "references": [{"source": "33c584b5-0579-4c06-b2a0-8d8329fcab9c", "tags": ["Exploit", "Third Party Advisory"], "url": "https://www.securin.io/zero-day/cve-2026-42373-hardcoded-telnet-backdoor-in-d-link-dir-605l-b2-end-of-life-"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Third Party Advisory"], "url": "https://www.securin.io/zero-day/cve-2026-42373-hardcoded-telnet-backdoor-in-d-link-dir-605l-b2-end-of-life-"}], "sourceIdentifier": "33c584b5-0579-4c06-b2a0-8d8329fcab9c", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-798"}], "source": "33c584b5-0579-4c06-b2a0-8d8329fcab9c", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": ["mips32_big-endian"], "status": "affected", "versions": {"scheme": "generic", "value": "B2"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "DIR-605L Firmware", "source": "cna", "vendor": "D-Link"}, "product": "dir-605l_firmware", "vendor": "d-link"}], "created": "2026-05-04T17:30:04.421860+00:00", "updated": "2026-05-04T17:30:04.678605+00:00", "vendors": ["d-link", "d-link$PRODUCT$dir-605l_firmware"]}