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CVE-2019-19945

Estado: ModificadaAlta (7.5)—💥 PoC

uhttpd in OpenWrt through 18.06.5 and 19.x through 19.07.0-rc2 has an integer signedness error. This leads to out-of-bounds access to a heap buffer and a subsequent crash. It can be triggered with an HTTP POST request to a CGI script, specifying both "Transfer-Encoding: chunked" and a large negative Content-Length value.

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).

💥 Exploits públicos

Hay código de explotación o plantillas de detección públicos. No es lo mismo que explotación activa confirmada (KEV), pero aumenta el riesgo: parchee con prioridad.

⚠️ Las pruebas de concepto de GitHub no están verificadas: algunas son falsas o contienen malware. No las ejecute nunca fuera de un laboratorio aislado.

Tecnologías afectadas (1)

Openwrt — Openwrt

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2019-19945",
  "cveTags": [],
  "metrics": {
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        "source": "nvd@nist.gov",
        "cvssData": {
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          "baseScore": 5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
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        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
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          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
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  "affected": [
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      "affectedData": [
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          "versions": [
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  "published": "2020-03-16T18:15:12.213",
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "description": [
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          "lang": "en",
          "value": "CWE-125"
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        {
          "lang": "en",
          "value": "CWE-681"
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      "lang": "en",
      "value": "uhttpd in OpenWrt through 18.06.5 and 19.x through 19.07.0-rc2 has an integer signedness error. This leads to out-of-bounds access to a heap buffer and a subsequent crash. It can be triggered with an HTTP POST request to a CGI script, specifying both \"Transfer-Encoding: chunked\" and a large negative Content-Length value."
    },
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      "lang": "es",
      "value": "uhttpd en OpenWrt versiones hasta 18.06.5 y versiones 19.x hasta 19.07.0-rc2, presenta un error de la propiedad signedness de enteros. Esto conlleva a un acceso fuera de límites en un búfer de la pila y un bloqueo posterior. Se puede activar con una petición HTTP POST en un script CGI, especificando tanto \"Transfer-Encoding: chunked\" como un valor negativo grande de Content-Length."
    }
  ],
  "lastModified": "2026-06-17T02:27:29.470",
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