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CVE-2021-28211

Status: ModifiedMedium (6.7)—

A heap overflow in LzmaUefiDecompressGetInfo function in EDK II.

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)

Tianocore — Edk2

CWEs

References

Raw JSON (NVD)

Show
{
  "id": "CVE-2021-28211",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 4.6,
          "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"
        },
        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "MEDIUM",
        "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": 6.7,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "HIGH",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 0.8
      }
    ]
  },
  "affected": [
    {
      "source": "infosec@edk2.groups.io",
      "affectedData": [
        {
          "vendor": "TianoCore",
          "product": "EDK II",
          "versions": [
            {
              "status": "affected",
              "version": "edk2-stable202008"
            }
          ]
        }
      ]
    }
  ],
  "published": "2021-06-11T16:15:12.503",
  "references": [
    {
      "url": "https://bugzilla.tianocore.org/show_bug.cgi?id=1816",
      "tags": [
        "Exploit",
        "Issue Tracking",
        "Patch",
        "Vendor Advisory"
      ],
      "source": "infosec@edk2.groups.io"
    },
    {
      "url": "https://bugzilla.tianocore.org/show_bug.cgi?id=1816",
      "tags": [
        "Exploit",
        "Issue Tracking",
        "Patch",
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "infosec@edk2.groups.io",
      "description": [
        {
          "lang": "en",
          "value": "CWE-122"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A heap overflow in LzmaUefiDecompressGetInfo function in EDK II."
    },
    {
      "lang": "es",
      "value": "Un desbordamiento de la pila en la función zmaUefiDecompressGetInfo en EDK II"
    }
  ],
  "lastModified": "2026-06-17T03:46:04.583",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:tianocore:edk2:202008:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "1C45BEB6-1F89-4813-B2CF-90639F9CE525"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "infosec@edk2.groups.io"
}