{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-05-01T21:17:17.847","vulnerabilities":[{"cve":{"id":"CVE-2021-25831","sourceIdentifier":"cve@mitre.org","published":"2021-03-01T16:15:14.353","lastModified":"2024-11-21T05:55:29.660","vulnStatus":"Modified","cveTags":[],"descriptions":[{"lang":"en","value":"A file extension handling issue was found in [core] module of ONLYOFFICE DocumentServer v4.0.0-9-v5.6.3. An attacker must request the conversion of the crafted file from PPTT into PPTX format. Using the chain of two other bugs related to improper string handling, a remote attacker can obtain remote code execution on DocumentServer."},{"lang":"es","value":"Se encontró un problema de manejo de extensiones de archivo en el módulo [core] de ONLYOFFICE DocumentServer versiones v4.0.0-9-v5.6.3. Un atacante debe pedir la conversión del archivo diseñado de PPTT a formato PPTX. Al Usar la cadena de otros dos bugs relacionados con el manejo inapropiado de cadenas, un atacante remoto puede obtener una ejecución de código remota en DocumentServer"}],"metrics":{"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":5.9}],"cvssMetricV2":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"2.0","vectorString":"AV:N/AC:L/Au:N/C:P/I:P/A:P","baseScore":7.5,"accessVector":"NETWORK","accessComplexity":"LOW","authentication":"NONE","confidentialityImpact":"PARTIAL","integrityImpact":"PARTIAL","availabilityImpact":"PARTIAL"},"baseSeverity":"HIGH","exploitabilityScore":10.0,"impactScore":6.4,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}]},"weaknesses":[{"source":"nvd@nist.gov","type":"Primary","description":[{"lang":"en","value":"NVD-CWE-noinfo"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:onlyoffice:document_server:*:*:*:*:*:*:*:*","versionStartIncluding":"4.0.0-9","versionEndIncluding":"5.6.3","matchCriteriaId":"076102C8-B582-4304-AD4E-0CDAE6DF191A"}]}]}],"references":[{"url":"https://github.com/ONLYOFFICE/DocumentServer","source":"cve@mitre.org","tags":["Product"]},{"url":"https://github.com/ONLYOFFICE/core","source":"cve@mitre.org","tags":["Product","Vendor Advisory"]},{"url":"https://github.com/ONLYOFFICE/core/blob/v5.6.4.13/ASCOfficePPTXFile/Editor/BinaryFileReaderWriter.cpp#L1918","source":"cve@mitre.org","tags":["Vendor Advisory"]},{"url":"https://github.com/ONLYOFFICE/core/blob/v5.6.4.13/ASCOfficePPTXFile/Editor/BinaryFileReaderWriter.cpp#L241","source":"cve@mitre.org","tags":["Vendor Advisory"]},{"url":"https://github.com/ONLYOFFICE/core/blob/v5.6.4.13/ASCOfficePPTXFile/PPTXFormat/Logic/Fills/BlipFill.cpp#L328","source":"cve@mitre.org","tags":["Vendor Advisory"]},{"url":"https://github.com/merrychap/poc_exploits/tree/master/ONLYOFFICE/CVE-2021-25831","source":"cve@mitre.org","tags":["Exploit","Vendor Advisory"]},{"url":"https://github.com/ONLYOFFICE/DocumentServer","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Product"]},{"url":"https://github.com/ONLYOFFICE/core","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Product","Vendor Advisory"]},{"url":"https://github.com/ONLYOFFICE/core/blob/v5.6.4.13/ASCOfficePPTXFile/Editor/BinaryFileReaderWriter.cpp#L1918","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Vendor Advisory"]},{"url":"https://github.com/ONLYOFFICE/core/blob/v5.6.4.13/ASCOfficePPTXFile/Editor/BinaryFileReaderWriter.cpp#L241","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Vendor Advisory"]},{"url":"https://github.com/ONLYOFFICE/core/blob/v5.6.4.13/ASCOfficePPTXFile/PPTXFormat/Logic/Fills/BlipFill.cpp#L328","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Vendor Advisory"]},{"url":"https://github.com/merrychap/poc_exploits/tree/master/ONLYOFFICE/CVE-2021-25831","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Exploit","Vendor Advisory"]}]}}]}