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CVE-2016-9380

Status: ModifiedHigh (7.5)—

The pygrub boot loader emulator in Xen, when nul-delimited output format is requested, allows local pygrub-using guest OS administrators to read or delete arbitrary files on the host via NUL bytes in the bootloader configuration file.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (2)

Citrix — XenserverXEN — XEN

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2016-9380",
  "cveTags": [],
  "metrics": {
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        "source": "nvd@nist.gov",
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          "accessVector": "LOCAL",
          "vectorString": "AV:L/AC:L/Au:N/C:P/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
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        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 3.9,
        "obtainUserPrivilege": false,
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        "userInteractionRequired": false
      }
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        "cvssData": {
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          "vectorString": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "NONE",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
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        "exploitabilityScore": 1.1
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  "affected": [
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      "affectedData": [
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          "versions": [
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  "published": "2017-01-23T21:59:02.753",
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          "value": "CWE-20"
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  ],
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      "value": "The pygrub boot loader emulator in Xen, when nul-delimited output format is requested, allows local pygrub-using guest OS administrators to read or delete arbitrary files on the host via NUL bytes in the bootloader configuration file."
    },
    {
      "lang": "es",
      "value": "El emulador de cargador de arranque pygrub en Xen, cuando se solicita el formato de salida delimitado por nulos, permite a administradores locales del SO invitado que utilizan pygrub leer o eliminar archivos arbitrarios en el host a través de bytes NUL en el archivo de configuración del gestor de arranque."
    }
  ],
  "lastModified": "2026-06-17T00:55:55.300",
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}