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CVE-2019-17263

Status: ModifiedLow (3.3)—
Severity3.3Low · CVSS 3.1
Exploitation probability0.54 %higher than 44% of CVEs
Active exploitationNonot in the CISA catalog
Public exploitNot knownno public code found

In libyal libfwsi before 20191006, libfwsi_extension_block_copy_from_byte_stream in libfwsi_extension_block.c has a heap-based buffer over-read because rejection of an unsupported size only considers values less than 6, even though values of 6 and 7 are also unsupported. NOTE: the vendor has disputed this as described in the GitHub issue

CVSS

Base score
3.3
Version
3.1
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days
0.54 %
Percentile among all scored CVEs
44
Score date
10/20/2026

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 (1)

Libfwsi Project — Libfwsi

CWEs

References

Show 6 references

Raw JSON (NVD)

Show
{
  "id": "CVE-2019-17263",
  "cveTags": [
    {
      "tags": [
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      "sourceIdentifier": "cve@mitre.org"
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  "metrics": {
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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          "role": "CISA Coordinator",
          "options": [
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              "exploitation": "none"
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              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2024-06-18T20:47:01.962904Z"
        }
      }
    ],
    "cvssMetricV2": [
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        "source": "nvd@nist.gov",
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          "accessVector": "LOCAL",
          "vectorString": "AV:L/AC:L/Au:N/C:N/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "LOW",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 3.9,
        "obtainUserPrivilege": false,
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    "cvssMetricV31": [
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  "published": "2019-10-06T22:15:10.227",
  "references": [
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      "url": "http://packetstormsecurity.com/files/154774/libyal-libfwsi-Buffer-Overread.html",
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      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In libyal libfwsi before 20191006, libfwsi_extension_block_copy_from_byte_stream in libfwsi_extension_block.c has a heap-based buffer over-read because rejection of an unsupported size only considers values less than 6, even though values of 6 and 7 are also unsupported. NOTE: the vendor has disputed this as described in the GitHub issue"
    },
    {
      "lang": "es",
      "value": "** EN DISPUTA ** En libyal libfwsi versiones anteriores a 20191006, la función libfwsi_extension_block_copy_from_byte_stream en el archivo libfwsi_extension_block.c, presenta una lectura excesiva de búfer en la región heap de la memoria porque el rechazo de un tamaño no admitido solo considera valores inferiores a 6, aunque los valores de 6 y 7 tampoco son compatibles. NOTA: el fabricante ha disputado esto, tal y como se describe en los problemas de GitHub."
    }
  ],
  "lastModified": "2026-06-17T02:23:35.930",
  "configurations": [
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          "cpeMatch": [
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              "vulnerable": true,
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              "versionEndExcluding": "20191006"
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          "operator": "OR"
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  "sourceIdentifier": "cve@mitre.org"
}