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CVE-2021-35237

Estado: ModificadaMedia (4.3)—

A missing HTTP header (X-Frame-Options) in Kiwi Syslog Server has left customers vulnerable to click jacking. Clickjacking is an attack that occurs when an attacker uses a transparent iframe in a window to trick a user into clicking on an actionable item, such as a button or link, to another server in which they have an identical webpage. The attacker essentially hijacks the user activity intended for the original server and sends them to the other server. This is an attack on both the user and the server.

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)

Solarwinds — Kiwi Syslog Server

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-35237",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 4.3,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "psirt@solarwinds.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "HIGH",
          "availabilityImpact": "LOW",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 3.4,
        "exploitabilityScore": 1.6
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 4.3,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 1.4,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "psirt@solarwinds.com",
      "affectedData": [
        {
          "vendor": "SolarWinds",
          "product": "Kiwi Syslog Server",
          "versions": [
            {
              "status": "affected",
              "version": "9.7.2 and previous versions",
              "lessThan": "9.7.2",
              "versionType": "custom"
            }
          ],
          "defaultStatus": "unaffected"
        }
      ]
    }
  ],
  "published": "2021-10-29T14:15:07.607",
  "references": [
    {
      "url": "https://documentation.solarwinds.com/en/success_center/kss/content/release_notes/kss_9-8_release_notes.htm",
      "tags": [
        "Release Notes",
        "Vendor Advisory"
      ],
      "source": "psirt@solarwinds.com"
    },
    {
      "url": "https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35237",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "psirt@solarwinds.com"
    },
    {
      "url": "https://documentation.solarwinds.com/en/success_center/kss/content/release_notes/kss_9-8_release_notes.htm",
      "tags": [
        "Release Notes",
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35237",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "psirt@solarwinds.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-1021"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-1021"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A missing HTTP header (X-Frame-Options) in Kiwi Syslog Server has left customers vulnerable to click jacking. Clickjacking is an attack that occurs when an attacker uses a transparent iframe in a window to trick a user into clicking on an actionable item, such as a button or link, to another server in which they have an identical webpage. The attacker essentially hijacks the user activity intended for the original server and sends them to the other server. This is an attack on both the user and the server."
    },
    {
      "lang": "es",
      "value": "Un encabezado HTTP faltante (X-Frame-Options) en Kiwi Syslog Server ha dejado a clientes vulnerables al clickjacking. El clickjacking es un ataque que se produce cuando un atacante usa un iframe transparente en una ventana para engañar a un usuario para que haga clic en un elemento accionable, como un botón o un enlace, a otro servidor en el que tienen una página web idéntica. El atacante esencialmente secuestra la actividad del usuario destinada al servidor original y la envía al otro servidor. Esto es un ataque tanto al usuario como al servidor"
    }
  ],
  "lastModified": "2026-06-17T03:57:21.583",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:solarwinds:kiwi_syslog_server:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "26A25843-D11B-44FB-8CD7-7FBC99D586E2",
              "versionEndIncluding": "9.7.2"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "psirt@solarwinds.com"
}