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CVE-2021-28496

Estado: ModificadaMedia (6.5)—

On systems running Arista EOS and CloudEOS with the affected release version, when using shared secret profiles the password configured for use by BiDirectional Forwarding Detection (BFD) will be leaked when displaying output over eAPI or other JSON outputs to other authenticated users on the device. The affected EOS Versions are: all releases in 4.22.x train, 4.23.9 and below releases in the 4.23.x train, 4.24.7 and below releases in the 4.24.x train, 4.25.4 and below releases in the 4.25.x train, 4.26.1 and below releases in the 4.26.x 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 — EOS

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-28496",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 4,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:S/C:P/I:N/A:N",
          "authentication": "SINGLE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "psirt@arista.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.7,
          "attackVector": "ADJACENT_NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.1
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 6.5,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "psirt@arista.com",
      "affectedData": [
        {
          "vendor": "Arista Networks",
          "product": "Arista EOS",
          "versions": [
            {
              "status": "affected",
              "version": "EOS-4.22",
              "versionType": "custom",
              "lessThanOrEqual": "EOS-4.22.12"
            },
            {
              "status": "affected",
              "version": "EOS-4.23",
              "lessThan": "EOS-4.23.10",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "EOS-4.24",
              "lessThan": "EOS-4.24.8",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "EOS-4.25",
              "lessThan": "EOS-4.25.5",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "EOS-4.26",
              "lessThan": "EOS-4.26.2",
              "versionType": "custom"
            }
          ]
        }
      ]
    }
  ],
  "published": "2021-10-21T17:15:07.740",
  "references": [
    {
      "url": "https://www.arista.com/en/support/advisories-notices/security-advisories/13243-security-advisory-0069",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "psirt@arista.com"
    },
    {
      "url": "https://www.arista.com/en/support/advisories-notices/security-advisories/13243-security-advisory-0069",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "psirt@arista.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-311"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-522"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "On systems running Arista EOS and CloudEOS with the affected release version, when using shared secret profiles the password configured for use by BiDirectional Forwarding Detection (BFD) will be leaked when displaying output over eAPI or other JSON outputs to other authenticated users on the device. The affected EOS Versions are: all releases in 4.22.x train, 4.23.9 and below releases in the 4.23.x train, 4.24.7 and below releases in the 4.24.x train, 4.25.4 and below releases in the 4.25.x train, 4.26.1 and below releases in the 4.26.x train"
    },
    {
      "lang": "es",
      "value": "En los sistemas que ejecutan Arista EOS y CloudEOS con la versión afectada, cuando son usados perfiles de secreto compartido, la contraseña configurada para su uso por BiDirectional Forwarding Detection (BFD) será filtrada cuando es mostrada la salida a través de eAPI u otras salidas JSON a otros usuarios autenticados en el dispositivo. Las Versiones de EOS afectadas son: todas las versiones 4.22.x train, versiones 4.23.9 y por debajo del train 4.23.x, versiones 4.24.7 y por debajo del train 4.24.x, versiones 4.25.4 y por debajo del train 4.25.x, versiones 4.26.1 y por debajo del train 4.26.x"
    }
  ],
  "lastModified": "2026-06-17T03:46:27.927",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "3770F52F-3DBE-4519-A4F1-85225CF7D67A",
              "versionEndIncluding": "4.22.7m",
              "versionStartIncluding": "4.22"
            },
            {
              "criteria": "cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "D3A3A22E-C028-436D-9B9B-B48DE5B02432",
              "versionEndExcluding": "4.23.10",
              "versionStartIncluding": "4.23"
            },
            {
              "criteria": "cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "62AAA114-6AAE-4CD8-A2CE-28FC6ED075FA",
              "versionEndExcluding": "4.24.8",
              "versionStartIncluding": "4.24"
            },
            {
              "criteria": "cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "A7087C7A-B407-4835-B8E6-07637124ECEA",
              "versionEndExcluding": "4.25.5",
              "versionStartIncluding": "4.25"
            },
            {
              "criteria": "cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "46FBEEA9-FB19-4ACB-A7A6-336692848CD5",
              "versionEndExcluding": "4.26.2",
              "versionStartIncluding": "4.26"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "psirt@arista.com"
}