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CVE-2020-5956

Status: ModifiedHigh (7.5)—

An issue was discovered in SdLegacySmm in Insyde InsydeH2O with kernel 5.1 before 05.15.11, 5.2 before 05.25.11, 5.3 before 05.34.11, and 5.4 before 05.42.11. The software SMI handler allows untrusted external input because it does not verify CommBuffer.

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 (1)

Insyde — Insydeh2o

CWEs

References

Raw JSON (NVD)

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  "id": "CVE-2020-5956",
  "cveTags": [],
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        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
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          "scope": "UNCHANGED",
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          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
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          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
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      "affectedData": [
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  "published": "2022-01-05T23:15:07.920",
  "references": [
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      "url": "https://security.netapp.com/advisory/ntap-20220223-0001/",
      "tags": [
        "Third Party Advisory"
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      "source": "cve@mitre.org"
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      "url": "https://www.insyde.com/security-pledge",
      "tags": [
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      "source": "cve@mitre.org"
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    {
      "url": "https://security.netapp.com/advisory/ntap-20220223-0001/",
      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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      "url": "https://www.insyde.com/security-pledge",
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  "vulnStatus": "Modified",
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          "lang": "en",
          "value": "CWE-20"
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      "lang": "en",
      "value": "An issue was discovered in SdLegacySmm in Insyde InsydeH2O with kernel 5.1 before 05.15.11, 5.2 before 05.25.11, 5.3 before 05.34.11, and 5.4 before 05.42.11. The software SMI handler allows untrusted external input because it does not verify CommBuffer."
    },
    {
      "lang": "es",
      "value": "Se ha detectado un problema en SdLegacySmm en InsydeH2O con el kernel 5.1 anteriores a 05.15.11, 5.2 anteriores a 05.25.11, 5.3 anteriores a 05.34.11 y 5.4 anteriores a 05.42.11. El manejador SMI de software permite una entrada externa no confiable porque no verifica el CommBuffer."
    }
  ],
  "lastModified": "2026-06-17T03:22:31.107",
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