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CVE-2021-27173

Estado: ModificadaAlta (7.5)—

An issue was discovered on FiberHome HG6245D devices through RP2613. There is a telnet?enable=0&key=calculated(BR0_MAC) backdoor API, without authentication, provided by the HTTP server. This will remove firewall rules and allow an attacker to reach the telnet server (used for the CLI).

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Fiberhome — Hg6245d Firmware

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2021-27173",
  "cveTags": [],
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        "type": "Primary",
        "source": "nvd@nist.gov",
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          "baseScore": 5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
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        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
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        "obtainUserPrivilege": false,
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
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        "impactScore": 3.6,
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  "affected": [
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      "affectedData": [
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  "published": "2021-02-10T19:15:15.183",
  "references": [
    {
      "url": "https://pierrekim.github.io/blog/2021-01-12-fiberhome-ont-0day-vulnerabilities.html#httpd-infoleak",
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  "vulnStatus": "Modified",
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          "value": "NVD-CWE-Other"
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  ],
  "descriptions": [
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      "lang": "en",
      "value": "An issue was discovered on FiberHome HG6245D devices through RP2613. There is a telnet?enable=0&key=calculated(BR0_MAC) backdoor API, without authentication, provided by the HTTP server. This will remove firewall rules and allow an attacker to reach the telnet server (used for the CLI)."
    },
    {
      "lang": "es",
      "value": "Se detectó un problema en los dispositivos FiberHome HG6245D versiones hasta RP2613. Se presenta una API backdoor de telnet?enable=0&key=calculated(BR0_MAC), sin autenticación, proporcionada por el servidor HTTP. Esto eliminará las reglas del firewall y permitirá a un atacante llegar al servidor telnet (usado para la CLI)"
    }
  ],
  "lastModified": "2026-06-17T03:44:24.113",
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