FKIE_CVE-2019-19945

Vulnerability from fkie_nvd - Published: 2020-03-16 18:15 - Updated: 2026-06-17 02:27
Severity
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
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.
References
cve@mitre.orghttps://github.com/openwrt/openwrt/commits/masterPatch, Third Party Advisory
cve@mitre.orghttps://openwrt.org/advisory/2020-01-13-1Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/openwrt/openwrt/commits/masterPatch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://openwrt.org/advisory/2020-01-13-1Vendor Advisory
Impacted products
Vendor Product Version
openwrt openwrt *
openwrt openwrt 19.07.0
openwrt openwrt 19.07.0
openwrt openwrt 19.07.0
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "source": "cve@mitre.org"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:openwrt:openwrt:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "50F23DBC-38D0-4966-AA8E-A2A67508E53B",
              "versionEndIncluding": "18.06.5",
              "versionStartIncluding": "18.06.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:openwrt:openwrt:19.07.0:-:*:*:*:*:*:*",
              "matchCriteriaId": "4FA469E2-9E63-4C9A-8EBA-10C8C870063A",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:openwrt:openwrt:19.07.0:rc1:*:*:*:*:*:*",
              "matchCriteriaId": "390F10D5-B9F6-4FD9-BD65-8189BC3B4B6F",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:openwrt:openwrt:19.07.0:rc2:*:*:*:*:*:*",
              "matchCriteriaId": "C6E0E897-9CA2-4FEB-BFFB-A0BECDB01741",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "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."
    },
    {
      "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 l\u00edmites en un b\u00fafer de la pila y un bloqueo posterior. Se puede activar con una petici\u00f3n HTTP POST en un script CGI, especificando tanto \"Transfer-Encoding: chunked\" como un valor negativo grande de Content-Length."
    }
  ],
  "id": "CVE-2019-19945",
  "lastModified": "2026-06-17T02:27:29.470",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 5.0,
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 10.0,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2020-03-16T18:15:12.213",
  "references": [
    {
      "source": "cve@mitre.org",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/openwrt/openwrt/commits/master"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://openwrt.org/advisory/2020-01-13-1"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/openwrt/openwrt/commits/master"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://openwrt.org/advisory/2020-01-13-1"
    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        },
        {
          "lang": "en",
          "value": "CWE-681"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.