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This rarely used option is used to send variable=content pairs toTELNET servers.Due to flaw in the option parser for sending `NEW_ENV` variables, libcurlcould be made to pass on uninitialized data from a stack based buffer to theserver. Therefore potentially revealing sensitive internal information to theserver using a clear-text network protocol.This could happen because curl did not call and use sscanf() correctly whenparsing the string provided by the application."}, {"lang": "es", "value": "curl soporta la opci\u00f3n de l\u00ednea de comandos \"-t\", conocida como \"CURLOPT_TELNETOPTIONS\" en libcurl. Debido a un fallo en el analizador de opciones para el env\u00edo de variables \"NEW_ENV\", libcurl podr\u00eda pasar datos no inicializados de un b\u00fafer en la regi\u00f3n stack de la memoria al servidor. Por lo tanto, podr\u00eda revelar potencialmente informaci\u00f3n interna confidencial al servidor usando un protocolo de red de texto sin cifrar. Esto podr\u00eda ocurrir porque curl no llam\u00f3 y us\u00f3 la funci\u00f3n sscanf() apropiadamente al analizar la cadena proporcionada por la aplicaci\u00f3n"}], "id": "CVE-2021-22925", "lastModified": "2026-10-14T11:16:54.113", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 5.0, "confidentialityImpact": "PARTIAL", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:N", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", 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