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CVE-2021-28497

Estado: ModificadaAlta (7.8)—

In Arista's MOS (Metamako Operating System) software which is supported on the 7130 product line, under certain conditions, the bash shell might be accessible to unprivileged users in situations where they should not have access. This issue affects: Arista Metamako Operating System All releases in the MOS-0.1x train MOS-0.26.6 and below releases in the MOS-0.2x train MOS-0.31.1 and below releases in the MOS-0.3x train

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 (1)

Arista — Metamako Operating System

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-28497",
  "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": "Secondary",
        "source": "psirt@arista.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 4.4,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "LOW",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 2.5,
        "exploitabilityScore": 1.8
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "psirt@arista.com",
      "affectedData": [
        {
          "vendor": "Arista",
          "product": "Metamako Operating System",
          "versions": [
            {
              "status": "affected",
              "version": "MOS-0.26.7",
              "lessThan": "MOS-0.16.7",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "MOS-0.32.0",
              "lessThan": "MOS-0.32.0",
              "versionType": "custom"
            }
          ],
          "platforms": [
            "Arista 7130 Systems running MOS"
          ]
        }
      ]
    }
  ],
  "published": "2021-09-09T13:15:09.210",
  "references": [
    {
      "url": "https://www.arista.com/en/support/advisories-notices/security-advisories/12913-security-advisory-65",
      "tags": [
        "Mitigation",
        "Vendor Advisory"
      ],
      "source": "psirt@arista.com"
    },
    {
      "url": "https://www.arista.com/en/support/advisories-notices/security-advisories/12913-security-advisory-65",
      "tags": [
        "Mitigation",
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "psirt@arista.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-264"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-Other"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In Arista's MOS (Metamako Operating System) software which is supported on the 7130 product line, under certain conditions, the bash shell might be accessible to unprivileged users in situations where they should not have access. This issue affects: Arista Metamako Operating System All releases in the MOS-0.1x train MOS-0.26.6 and below releases in the MOS-0.2x train MOS-0.31.1 and below releases in the MOS-0.3x train"
    },
    {
      "lang": "es",
      "value": "En el software MOS (Sistema Operativo Metamako) de Arista, que es compatible con la línea de productos 7130, en determinadas condiciones, el shell bash podría ser accesible a usuarios no privilegiados en situaciones en las que no deberían tener acceso. Este problema afecta a: Sistema Operativo Metamako de Arista Todas las versiones MOS-0.1x train MOS-0.26.6 y versiones inferiores en MOS-0.2x train MOS-0.31.1 y versiones inferiores en MOS-0.3x train"
    }
  ],
  "lastModified": "2026-06-17T03:46:28.043",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "vulnerable": true,
              "matchCriteriaId": "2EB89E3B-DBD9-433C-BF75-DF055380A9F6",
              "versionEndIncluding": "0.26.6"
            },
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              "vulnerable": true,
              "matchCriteriaId": "C66AFCAE-47B5-47D5-96AF-C0986611A4C0",
              "versionEndExcluding": "0.32.0",
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          ],
          "operator": "OR"
        },
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          "operator": "OR"
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      "operator": "AND"
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  "sourceIdentifier": "psirt@arista.com"
}