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CVE-2019-16784

Estado: ModificadaAlta (7.8)—

In PyInstaller before version 3.6, only on Windows, a local privilege escalation vulnerability is present in this particular case: If a software using PyInstaller in "onefile" mode is launched by a privileged user (at least more than the current one) which have his "TempPath" resolving to a world writable directory. This is the case for example if the software is launched as a service or as a scheduled task using a system account (TempPath will be C:\Windows\Temp). In order to be exploitable the software has to be (re)started after the attacker launch the exploit program, so for a service launched at startup, a service restart is needed (e.g. after a crash or an upgrade).

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Fuente: mapeo oficial MITRE CTID (CVE → ATT&CK).

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Execution PreventionApplication Isolation and SandboxingExploit ProtectionUpdate SoftwareVulnerability ScanningThreat Intelligence Program

Tecnologías afectadas (1)

Pyinstaller — Pyinstaller

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2019-16784",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 4.4,
          "accessVector": "LOCAL",
          "vectorString": "AV:L/AC:M/Au:N/C:P/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 3.4,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
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        "impactScore": 5.9,
        "exploitabilityScore": 1
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
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        "impactScore": 5.9,
        "exploitabilityScore": 1.8
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  "affected": [
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      "affectedData": [
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          "vendor": "PyInstaller",
          "product": "PyInstaller",
          "versions": [
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              "status": "affected",
              "version": "< 3.6"
            }
          ],
          "platforms": [
            "windows"
          ]
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      ]
    }
  ],
  "published": "2020-01-14T20:15:11.957",
  "references": [
    {
      "url": "https://github.com/pyinstaller/pyinstaller/security/advisories/GHSA-7fcj-pq9j-wh2r",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/pyinstaller/pyinstaller/security/advisories/GHSA-7fcj-pq9j-wh2r",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-250"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-732"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In PyInstaller before version 3.6, only on Windows, a local privilege escalation vulnerability is present in this particular case: If a software using PyInstaller in \"onefile\" mode is launched by a privileged user (at least more than the current one) which have his \"TempPath\" resolving to a world writable directory. This is the case for example if the software is launched as a service or as a scheduled task using a system account (TempPath will be C:\\Windows\\Temp). In order to be exploitable the software has to be (re)started after the attacker launch the exploit program, so for a service launched at startup, a service restart is needed (e.g. after a crash or an upgrade)."
    },
    {
      "lang": "es",
      "value": "En PyInstaller versiones anteriores a 3.6, solo sobre Windows, se presenta una vulnerabilidad de escalada de privilegios local en este caso particular: si un software que usa PyInstaller en modo \"onefile\" es activado por un usuario privilegiado (al menos más que el actual) que tiene su \"TempPath\" resolviendo en un directorio de tipo world writable. Este es el caso, por ejemplo, si el software es iniciado como un servicio o como una tarea programada utilizando una cuenta system (TempPath será C:\\Windows\\Temp). A fin de ser explotable, el software tiene  que ser reiniciado después de que el atacante active el programa de explotación, por lo que para un servicio activado en el inicio, es necesario reiniciar el servicio (por ejemplo, después de un bloqueo o una actualización)."
    }
  ],
  "lastModified": "2026-06-17T02:22:47.880",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "matchCriteriaId": "C5E0993A-6A1B-4A54-992B-04E6B64AB19A",
              "versionEndExcluding": "3.6"
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  "sourceIdentifier": "security-advisories@github.com"
}