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CVE-2021-25263

Estado: ModificadaAlta (7.8)—

Local privilege vulnerability in Yandex Browser for Windows prior to 21.9.0.390 allows a local, low privileged, attacker to execute arbitary code with the SYSTEM privileges through manipulating files in directory with insecure permissions during Yandex Browser update process.

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)

Yandex — Yandex Browser

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-25263",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 4.6,
          "accessVector": "LOCAL",
          "vectorString": "AV:L/AC:L/Au:N/C:P/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 3.9,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "browser-security@yandex-team.ru",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "Yandex Browser (Desktop)",
          "versions": [
            {
              "status": "affected",
              "version": "All versions prior to version 21.9.0.390"
            }
          ]
        }
      ]
    }
  ],
  "published": "2021-08-17T19:15:08.103",
  "references": [
    {
      "url": "https://yandex.com/bugbounty/i/hall-of-fame-browser/",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "browser-security@yandex-team.ru"
    },
    {
      "url": "https://yandex.com/bugbounty/i/hall-of-fame-browser/",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-732"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Local privilege vulnerability in Yandex Browser for Windows prior to 21.9.0.390 allows a local, low privileged, attacker to execute arbitary code with the SYSTEM privileges through manipulating files in directory with insecure permissions during Yandex Browser update process."
    },
    {
      "lang": "es",
      "value": "La vulnerabilidad de privilegios locales en Yandex Browser para Windows anterior a la versión 21.9.0.390 permite a un atacante local, con pocos privilegios, ejecutar código arbitrario con los privilegios del SISTEMA a través de la manipulación de archivos en el directorio con permisos inseguros durante el proceso de actualización de Yandex Browser"
    }
  ],
  "lastModified": "2026-06-17T03:41:44.000",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:yandex:yandex_browser:*:*:*:*:*:windows:*:*",
              "vulnerable": true,
              "matchCriteriaId": "21AC29BD-6018-46C2-9BE7-225090DDC637",
              "versionEndExcluding": "21.9.0.390"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "browser-security@yandex-team.ru"
}