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CVE-2021-23253

Estado: ModificadaMedia (5.3)—

Opera Mini for Android below 53.1 displays URL left-aligned in the address field. This allows a malicious attacker to craft a URL with a long domain name, e.g. www.safe.opera.com.attacker.com. With the URL being left-aligned, the user will only see the front part (e.g. www.safe.opera.com…) The exact amount depends on the phone screen size but the attacker can craft a number of different domains and target different phones. Starting with version 53.1 Opera Mini displays long URLs with the top-level domain label aligned to the right of the address field which mitigates the issue.

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)

Opera — Opera Mini

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-23253",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.3,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 1.4,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "security@opera.com",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "Opera Mini for Android",
          "versions": [
            {
              "status": "affected",
              "version": "Below 53.1"
            }
          ]
        }
      ]
    }
  ],
  "published": "2021-01-11T16:15:15.663",
  "references": [
    {
      "url": "https://security.opera.com/address-bar-spoofing-in-opera-mini-opera-security-advisories/",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "security@opera.com"
    },
    {
      "url": "https://security.opera.com/address-bar-spoofing-in-opera-mini-opera-security-advisories/",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-Other"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Opera Mini for Android below 53.1 displays URL left-aligned in the address field. This allows a malicious attacker to craft a URL with a long domain name, e.g. www.safe.opera.com.attacker.com. With the URL being left-aligned, the user will only see the front part (e.g. www.safe.opera.com…) The exact amount depends on the phone screen size but the attacker can craft a number of different domains and target different phones. Starting with version 53.1 Opera Mini displays long URLs with the top-level domain label aligned to the right of the address field which mitigates the issue."
    },
    {
      "lang": "es",
      "value": "Opera Mini para Android versiones por debajo de 53.1, muestra la URL alineada a la izquierda en el campo de dirección. Esto permite a un atacante malicioso crear una URL con un nombre de dominio largo, por ejemplo, www.safe.opera.com.attacker.com. Con la URL alineada a la izquierda, el usuario solo verá la parte frontal (por ejemplo, www.safe.opera.com ...) La cantidad exacta depende del tamaño de la pantalla del teléfono, pero el atacante puede crear varios dominios diferentes y apuntar a diferentes teléfonos . A partir de la versión 53.1, Opera Mini muestra URL largas con la etiqueta de dominio de nivel superior alineada a la derecha del campo de dirección, lo que mitiga el problema"
    }
  ],
  "lastModified": "2026-06-17T03:38:28.703",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:opera:opera_mini:*:*:*:*:*:android:*:*",
              "vulnerable": true,
              "matchCriteriaId": "EA9B517F-93FF-4082-8F4E-622860AC3668",
              "versionEndExcluding": "53.1"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security@opera.com"
}