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CVE-2021-4300

Estado: ModificadaCrítica (9.8)—
Gravedad9.8Crítica · CVSS 3.1
Probabilidad de explotación0.69 %mayor que el 52 % de las CVE
Explotación activaNono figura en el catálogo de CISA
Exploit públicoNo conocidosin código público localizado

Se ha encontrado una vulnerabilidad en Ghostlander Halcyon y ha sido clasificada como crítica. La función CBlock::AddToBlockIndex del archivo src/main.cpp del componente Block Verification es afectada por esta vulnerabilidad. La manipulación conduce a controles de acceso inadecuados. El ataque se puede lanzar de forma remota. La actualización a la versión 1.1.1.0-hal puede solucionar este problema. El identificador del parche es 0675b25ae9cc10b5fdc8ea3a32c642979762d45e. Se recomienda actualizar el componente afectado. A esta vulnerabilidad se le asignó el identificador VDB-217417.

CVSS

Puntuación base
9.8
Versión
3.1
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días
0.69 %
Percentil entre todas las CVEs puntuadas
52
Fecha de la puntuación
21/10/2026

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)

Halcyon Project — Halcyon

CWE

Referencias

Mostrar las 8 referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2021-4300",
  "cveTags": [],
  "metrics": {
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        "type": "Secondary",
        "source": "cna@vuldb.com",
        "cvssData": {
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          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:S/C:P/I:P/A:P",
          "authentication": "SINGLE",
          "integrityImpact": "PARTIAL",
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          "confidentialityImpact": "PARTIAL"
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          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "LOW",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "LOW"
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        "impactScore": 3.4,
        "exploitabilityScore": 2.8
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
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          "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"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "cna@vuldb.com",
      "affectedData": [
        {
          "vendor": "ghostlander",
          "modules": [
            "Block Verification"
          ],
          "product": "Halcyon",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
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  ],
  "published": "2023-01-04T22:15:08.903",
  "references": [
    {
      "url": "https://github.com/ghostlander/Halcyon/commit/0675b25ae9cc10b5fdc8ea3a32c642979762d45e",
      "tags": [
        "Patch"
      ],
      "source": "cna@vuldb.com"
    },
    {
      "url": "https://github.com/ghostlander/Halcyon/releases/tag/v1.1.1.0-hal",
      "tags": [
        "Release Notes"
      ],
      "source": "cna@vuldb.com"
    },
    {
      "url": "https://vuldb.com/?ctiid.217417",
      "tags": [
        "Permissions Required",
        "Third Party Advisory"
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      "source": "cna@vuldb.com"
    },
    {
      "url": "https://vuldb.com/?id.217417",
      "tags": [
        "Permissions Required",
        "Third Party Advisory"
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      "source": "cna@vuldb.com"
    },
    {
      "url": "https://github.com/ghostlander/Halcyon/commit/0675b25ae9cc10b5fdc8ea3a32c642979762d45e",
      "tags": [
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      "tags": [
        "Release Notes"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
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      "tags": [
        "Permissions Required",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
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      "url": "https://vuldb.com/?id.217417",
      "tags": [
        "Permissions Required",
        "Third Party Advisory"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "cna@vuldb.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-284"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-Other"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A vulnerability has been found in ghostlander Halcyon and classified as critical. Affected by this vulnerability is the function CBlock::AddToBlockIndex of the file src/main.cpp of the component Block Verification. The manipulation leads to improper access controls. The attack can be launched remotely. Upgrading to version 1.1.1.0-hal is able to address this issue. The identifier of the patch is 0675b25ae9cc10b5fdc8ea3a32c642979762d45e. It is recommended to upgrade the affected component. The identifier VDB-217417 was assigned to this vulnerability."
    },
    {
      "lang": "es",
      "value": "Se ha encontrado una vulnerabilidad en Ghostlander Halcyon y ha sido clasificada como crítica. La función CBlock::AddToBlockIndex del archivo src/main.cpp del componente Block Verification es afectada por esta vulnerabilidad. La manipulación conduce a controles de acceso inadecuados. El ataque se puede lanzar de forma remota. La actualización a la versión 1.1.1.0-hal puede solucionar este problema. El identificador del parche es 0675b25ae9cc10b5fdc8ea3a32c642979762d45e. Se recomienda actualizar el componente afectado. A esta vulnerabilidad se le asignó el identificador VDB-217417."
    }
  ],
  "lastModified": "2026-06-17T04:19:27.370",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:halcyon_project:halcyon:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "FD1553FD-C96D-4F32-B93F-E785D7CC4329",
              "versionEndExcluding": "1.1.1.0"
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          "operator": "OR"
        }
      ]
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  "sourceIdentifier": "cna@vuldb.com"
}