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CVE-2021-40834

Estado: ModificadaMedia (4.3)—

A user interface overlay vulnerability was discovered in F-secure SAFE Browser for Android. When user click on a specially crafted seemingly legitimate URL SAFE browser goes into full screen and hides the user interface. A remote attacker can leverage this to perform spoofing attack.

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)

F-secure — Safe

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-40834",
  "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": "cve-notifications-us@f-secure.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 4.3,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:L",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "LOW",
          "privilegesRequired": "HIGH",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 3.4,
        "exploitabilityScore": 0.9
      },
      {
        "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": "cve-notifications-us@f-secure.com",
      "affectedData": [
        {
          "vendor": "F-Secure",
          "product": "F-Secure Mobile Security",
          "versions": [
            {
              "status": "affected",
              "version": "18.5x",
              "lessThan": "17.9*",
              "versionType": "custom"
            }
          ],
          "platforms": [
            "Android"
          ]
        }
      ]
    }
  ],
  "published": "2021-12-10T14:15:10.093",
  "references": [
    {
      "url": "https://www.f-secure.com/en/business/programs/vulnerability-reward-program/hall-of-fame",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "cve-notifications-us@f-secure.com"
    },
    {
      "url": "https://www.f-secure.com/en/business/support-and-downloads/security-advisories/cve-2021-40834",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "cve-notifications-us@f-secure.com"
    },
    {
      "url": "https://www.f-secure.com/en/business/programs/vulnerability-reward-program/hall-of-fame",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://www.f-secure.com/en/business/support-and-downloads/security-advisories/cve-2021-40834",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-1021"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A user interface overlay vulnerability was discovered in F-secure SAFE Browser for Android. When user click on a specially crafted seemingly legitimate URL SAFE browser goes into full screen and hides the user interface. A remote attacker can leverage this to perform spoofing attack."
    },
    {
      "lang": "es",
      "value": "Se ha detectado una vulnerabilidad de superposición de la interfaz de usuario en F-secure SAFE Browser para Android. Cuando el usuario hace clic en una URL aparentemente legítima especialmente diseñada, el navegador SAFE pasa a pantalla completa y oculta la interfaz de usuario. Un atacante remoto puede aprovechar esto para llevar a cabo un ataque de suplantación de identidad"
    }
  ],
  "lastModified": "2026-06-17T04:07:30.460",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:f-secure:safe:*:*:*:*:*:android:*:*",
              "vulnerable": true,
              "matchCriteriaId": "0ECDAF3F-FF7E-46E1-AB62-8673A1256EA9",
              "versionEndIncluding": "17.9"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "cve-notifications-us@f-secure.com"
}