FKIE_CVE-2020-5235

Vulnerability from fkie_nvd - Published: 2020-02-04 03:15 - Updated: 2026-06-17 03:21
Severity
6.5 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
There is a potentially exploitable out of memory condition In Nanopb before 0.4.1, 0.3.9.5, and 0.2.9.4. When nanopb is compiled with PB_ENABLE_MALLOC, the message to be decoded contains a repeated string, bytes or message field and realloc() runs out of memory when expanding the array nanopb can end up calling `free()` on a pointer value that comes from uninitialized memory. Depending on platform this can result in a crash or further memory corruption, which may be exploitable in some cases. This problem is fixed in nanopb-0.4.1, nanopb-0.3.9.5, nanopb-0.2.9.4.
References
security-advisories@github.comhttps://github.com/nanopb/nanopb/commit/45582f1f97f49e2abfdba1463d1e1027682d9856Patch, Third Party Advisory
security-advisories@github.comhttps://github.com/nanopb/nanopb/commit/7b396821ddd06df8e39143f16e1dc0a4645b89a3Patch, Third Party Advisory
security-advisories@github.comhttps://github.com/nanopb/nanopb/commit/aa9d0d1ca78d6adec3adfeecf3a706c7f9df81f2Patch, Third Party Advisory
security-advisories@github.comhttps://github.com/nanopb/nanopb/security/advisories/GHSA-gcx3-7m76-287pPatch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/nanopb/nanopb/commit/45582f1f97f49e2abfdba1463d1e1027682d9856Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/nanopb/nanopb/commit/7b396821ddd06df8e39143f16e1dc0a4645b89a3Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/nanopb/nanopb/commit/aa9d0d1ca78d6adec3adfeecf3a706c7f9df81f2Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/nanopb/nanopb/security/advisories/GHSA-gcx3-7m76-287pPatch, Third Party Advisory
Impacted products
Vendor Product Version
nanopb_project nanopb *
nanopb_project nanopb *
nanopb_project nanopb *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "Nanopb",
          "vendor": "nanopb",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.2.9.4"
            },
            {
              "status": "affected",
              "version": "\u003e= 0.3.0, \u003c 0.3.9.5"
            },
            {
              "status": "affected",
              "version": "\u003e= 0.4.0, \u003c 0.4.1"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:nanopb_project:nanopb:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "4C0C3188-DACC-4BFC-88EE-17A3EA6DECB4",
              "versionEndExcluding": "0.2.9.4",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:nanopb_project:nanopb:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "7AC327EC-CA02-408D-B00C-1A23ACB339F4",
              "versionEndExcluding": "0.3.9.5",
              "versionStartIncluding": "0.3.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:nanopb_project:nanopb:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "7F47A79C-0D54-439F-ADE6-BB093268FAA3",
              "versionEndExcluding": "0.4.1",
              "versionStartIncluding": "0.4.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "There is a potentially exploitable out of memory condition In Nanopb before 0.4.1, 0.3.9.5, and 0.2.9.4. When nanopb is compiled with PB_ENABLE_MALLOC, the message to be decoded contains a repeated string, bytes or message field and realloc() runs out of memory when expanding the array nanopb can end up calling `free()` on a pointer value that comes from uninitialized memory. Depending on platform this can result in a crash or further memory corruption, which may be exploitable in some cases. This problem is fixed in nanopb-0.4.1, nanopb-0.3.9.5, nanopb-0.2.9.4."
    },
    {
      "lang": "es",
      "value": "Se presenta una condici\u00f3n de falta de memoria explotable potencialmente en Nanopb versiones anteriores a 0.4.1, 0.3.9.5 y 0.2.9.4. Cuando se compila nanopb con PB_ENABLE_MALLOC, el mensaje que va a ser decodificado contiene una cadena repetida, campo bytes o message y la funci\u00f3n realloc() se queda sin memoria cuando se expande la matriz, nanopb puede terminar llamando a \"free()\" en un valor de puntero que proviene de una memoria no inicializada. Dependiendo de la plataforma, esto puede resultar en un bloqueo o una mayor corrupci\u00f3n de la memoria, que puede ser explotable en algunos casos. Este problema es corregido en las versiones nanopb-0.4.1, nanopb-0.3.9.5, nanopb-0.2.9.4."
    }
  ],
  "id": "CVE-2020-5235",
  "lastModified": "2026-06-17T03:21:04.997",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "HIGH",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 7.5,
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 10.0,
        "impactScore": 6.4,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 3.7,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      },
      {
        "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": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2020-02-04T03:15:10.657",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/nanopb/nanopb/commit/45582f1f97f49e2abfdba1463d1e1027682d9856"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/nanopb/nanopb/commit/7b396821ddd06df8e39143f16e1dc0a4645b89a3"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/nanopb/nanopb/commit/aa9d0d1ca78d6adec3adfeecf3a706c7f9df81f2"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/nanopb/nanopb/security/advisories/GHSA-gcx3-7m76-287p"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/nanopb/nanopb/commit/45582f1f97f49e2abfdba1463d1e1027682d9856"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/nanopb/nanopb/commit/7b396821ddd06df8e39143f16e1dc0a4645b89a3"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/nanopb/nanopb/commit/aa9d0d1ca78d6adec3adfeecf3a706c7f9df81f2"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/nanopb/nanopb/security/advisories/GHSA-gcx3-7m76-287p"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





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

Author Source Type Date Other

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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • 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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.