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CVE-2021-33790

Estado: ModificadaCrítica (9.8)—

The RebornCore library before 4.7.3 allows remote code execution because it deserializes untrusted data in ObjectInputStream.readObject as part of reborncore.common.network.ExtendedPacketBuffer. An attacker can instantiate any class on the classpath with any data. A class usable for exploitation might or might not be present, depending on what Minecraft modifications are installed.

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)

Techreborn — Reborncore

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-33790",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 7.5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "HIGH",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
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    "cvssMetricV31": [
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        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 9.8,
          "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"
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        "impactScore": 5.9,
        "exploitabilityScore": 3.9
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  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
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  "published": "2021-05-31T04:15:08.153",
  "references": [
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      "url": "https://github.com/TechReborn/RebornCore/security/advisories/GHSA-r7pg-4xrf-7mrm",
      "tags": [
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      "source": "cve@mitre.org"
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      "tags": [
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      "source": "cve@mitre.org"
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      "url": "https://www.curseforge.com/minecraft/mc-mods/reborncore",
      "tags": [
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        "Third Party Advisory"
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    {
      "url": "https://github.com/TechReborn/RebornCore/security/advisories/GHSA-r7pg-4xrf-7mrm",
      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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    {
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      "tags": [
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "source": "nvd@nist.gov",
      "description": [
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          "lang": "en",
          "value": "CWE-502"
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The RebornCore library before 4.7.3 allows remote code execution because it deserializes untrusted data in ObjectInputStream.readObject as part of reborncore.common.network.ExtendedPacketBuffer. An attacker can instantiate any class on the classpath with any data. A class usable for exploitation might or might not be present, depending on what Minecraft modifications are installed."
    },
    {
      "lang": "es",
      "value": "La biblioteca RebornCore versiones anteriores a 4.7.3, permite una ejecución de código remota porque deserializa datos no confiables en la función ObjectInputStream.readObject como parte de reborncore.common.network.ExtendedPacketBuffer. Un atacante puede crear una instancia de cualquier clase en la ruta de clases con cualquier dato. Una clase utilizable para explotación puede estar presente o no, dependiendo de las modificaciones de Minecraft instaladas"
    }
  ],
  "lastModified": "2026-06-17T03:55:14.397",
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