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CVE-2021-31988

Estado: ModificadaAlta (8.8)—

A user controlled parameter related to SMTP test functionality is not correctly validated making it possible to add the Carriage Return and Line Feed (CRLF) control characters and include arbitrary SMTP headers in the generated test email.

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 (4)

Axis — Axis OSAxis — Axis OS 2016Axis — Axis OS 2018Axis — Axis OS 2020

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-31988",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 6.8,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 8.8,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "product-security@axis.com",
      "affectedData": [
        {
          "vendor": "Axis Communications AB",
          "product": "AXIS OS",
          "versions": [
            {
              "status": "affected",
              "version": "AXIS OS 5.51 or later"
            }
          ],
          "defaultStatus": "unaffected"
        }
      ]
    }
  ],
  "published": "2021-10-05T22:15:07.937",
  "references": [
    {
      "url": "https://www.axis.com/files/tech_notes/CVE-2021-31988.pdf",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "product-security@axis.com"
    },
    {
      "url": "https://www.axis.com/files/tech_notes/CVE-2021-31988.pdf",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "product-security@axis.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-1286"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-74"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A user controlled parameter related to SMTP test functionality is not correctly validated making it possible to add the Carriage Return and Line Feed (CRLF) control characters and include arbitrary SMTP headers in the generated test email."
    },
    {
      "lang": "es",
      "value": "Un parámetro controlado por el usuario relacionado con la funcionalidad de prueba de SMTP no es comprobado correctamente, haciendo posible añadir los caracteres de control Carriage Return and Line Feed (CRLF) e incluir encabezados SMTP arbitrarios en el correo electrónico de prueba generado"
    }
  ],
  "lastModified": "2026-06-17T03:52:38.510",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "vulnerable": true,
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              "versionEndExcluding": "10.7"
            },
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            },
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  "sourceIdentifier": "product-security@axis.com"
}