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CVE-2021-3507

Estado: ModificadaMedia (6.1)—

A heap buffer overflow was found in the floppy disk emulator of QEMU up to 6.0.0 (including). It could occur in fdctrl_transfer_handler() in hw/block/fdc.c while processing DMA read data transfers from the floppy drive to the guest system. A privileged guest user could use this flaw to crash the QEMU process on the host resulting in DoS scenario, or potential information leakage from the host memory.

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 (3)

Debian — Debian LinuxQemu — QemuRedhat — Enterprise Linux

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2021-3507",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 3.6,
          "accessVector": "LOCAL",
          "vectorString": "AV:L/AC:L/Au:N/C:P/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 4.9,
        "baseSeverity": "LOW",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 3.9,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 6.1,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "LOW",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 4.2,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "secalert@redhat.com",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "QEMU",
          "versions": [
            {
              "status": "affected",
              "version": "up to 6.0.0 (including)"
            }
          ]
        }
      ]
    }
  ],
  "published": "2021-05-06T16:15:07.547",
  "references": [
    {
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1951118",
      "tags": [
        "Exploit",
        "Issue Tracking",
        "Third Party Advisory"
      ],
      "source": "secalert@redhat.com"
    },
    {
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      "tags": [
        "Mailing List",
        "Third Party Advisory"
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      "source": "secalert@redhat.com"
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    {
      "url": "https://security.netapp.com/advisory/ntap-20210528-0005/",
      "tags": [
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      "source": "secalert@redhat.com"
    },
    {
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1951118",
      "tags": [
        "Exploit",
        "Issue Tracking",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html",
      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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      "tags": [
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "secalert@redhat.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-119"
        }
      ]
    },
    {
      "type": "Secondary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A heap buffer overflow was found in the floppy disk emulator of QEMU up to 6.0.0 (including). It could occur in fdctrl_transfer_handler() in hw/block/fdc.c while processing DMA read data transfers from the floppy drive to the guest system. A privileged guest user could use this flaw to crash the QEMU process on the host resulting in DoS scenario, or potential information leakage from the host memory."
    },
    {
      "lang": "es",
      "value": "Se encontró un desbordamiento del búfer de pila en el emulador de disquete de QEMU versiones hasta 6.0.0 (incluyéndola). Podría ocurrir en la función fdctrl_transfer_handler() en el archivo hw/block/fdc.c mientras son procesados transferencias de datos de lectura DMA desde la unidad de disquete al sistema invitado. Un usuario invitado privilegiado podría usar este fallo para bloquear el proceso QEMU en el host, resultando en un escenario de DoS o una posible filtración de información de la memoria del host"
    }
  ],
  "lastModified": "2026-06-17T04:05:15.387",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "vulnerable": true,
              "matchCriteriaId": "B002BA5C-F99C-460E-A53C-F61A813DD689",
              "versionEndIncluding": "6.0.0"
            }
          ],
          "operator": "OR"
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      ]
    },
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      "nodes": [
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            },
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              "vulnerable": true,
              "matchCriteriaId": "053C1B35-3869-41C2-9551-044182DE0A64"
            },
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              "vulnerable": true,
              "matchCriteriaId": "3AA08768-75AF-4791-B229-AE938C780959"
            }
          ],
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  "sourceIdentifier": "secalert@redhat.com"
}