[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$f7plGSGr7-yn-DcvokAOAcickePp2CqFf-b0iEFI-K6k":3,"g5a-risk:CVE-2021-25831":118},{"success":4,"data":5,"meta":116},true,{"cveId":6,"title":7,"description":8,"shortDescription":9,"publishedDate":10,"lastModified":11,"cvssScore":12,"cvssVector":13,"cvssMetrics":14,"epssScore":39,"epssPercentile":27,"epssTimeSeries":40,"severity":41,"affectedProducts":42,"affectedProductsCount":48,"references":49,"referencesCount":72,"weaknesses":73,"weaknessesCount":48,"isActivelyExploited":77,"cisaInfo":27,"otxData":27,"relatedBlogPosts":78,"seoMetadata":79,"configurations":104,"relatedVendorCves":114,"notableEvents":115},"CVE-2021-25831","What is CVE-2021-25831?","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.","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 craft...","2021-03-01T16:15:14.353","2021-03-15T19:53:12.087",9.8,"CVSS:3.1\u002FAV:N\u002FAC:L\u002FPR:N\u002FUI:N\u002FS:U\u002FC:H\u002FI:H\u002FA:H",{"CVSSMetricV31":15,"CVSSMetricV30":27,"CVSSMetricV2":30,"CVSSMetricV40":27},[16],{"Source":17,"Type":18,"CVSSData":19,"ExploitabilityScore":28,"ImpactScore":29},"nvd@nist.gov","Primary",{"Version":20,"VectorString":13,"AttackVector":21,"AttackComplexity":22,"PrivilegesRequired":23,"UserInteraction":23,"Scope":24,"ConfidentialityImpact":25,"IntegrityImpact":25,"AvailabilityImpact":25,"BaseScore":12,"BaseSeverity":26,"ExploitCodeMaturity":27,"RemediationLevel":27,"ReportConfidence":27,"TemporalScore":27,"TemporalSeverity":27,"ConfidentialityRequirement":27,"IntegrityRequirement":27,"AvailabilityRequirement":25,"ModifiedAttackVector":27,"ModifiedAttackComplexity":27,"ModifiedPrivilegesRequired":27,"ModifiedUserInteraction":27,"ModifiedScope":27,"ModifiedConfidentialityImpact":27,"ModifiedIntegrityImpact":27,"ModifiedAvailabilityImpact":27,"EnvironmentalScore":27,"EnvironmentalSeverity":27},"3.1","NETWORK","LOW","NONE","UNCHANGED","HIGH","CRITICAL",null,3.9,5.9,[31],{"Source":17,"Type":18,"CVSSData":32,"BaseSeverity":25,"ExploitabilityScore":37,"ImpactScore":38,"ACInsufInfo":27,"ObtainAllPrivilege":27,"ObtainUserPrivilege":27,"ObtainOtherPrivilege":27,"UserInteractionRequired":27},{"Version":33,"VectorString":34,"AccessVector":21,"AccessComplexity":22,"Authentication":23,"ConfidentialityImpact":35,"IntegrityImpact":35,"AvailabilityImpact":35,"BaseScore":36,"BaseSeverity":27,"Exploitability":27,"RemediationLevel":27,"ReportConfidence":27,"TemporalScore":27,"CollateralDamagePotential":27,"TargetDistribution":27,"ConfidentialityRequirement":27,"IntegrityRequirement":27,"AvailabilityRequirement":27,"EnvironmentalScore":27},"2.0","AV:N\u002FAC:L\u002FAu:N\u002FC:P\u002FI:P\u002FA:P","PARTIAL",7.5,10,6.4,0.11503,[39,39,39,39,39,39,39],"Critical",[43],{"vendor":44,"product":45,"version":46,"criteria":47,"vulnerable":4},"onlyoffice","document_server","*","cpe:2.3:a:onlyoffice:document_server:*:*:*:*:*:*:*:*",1,[50,55,59,62,65,68],{"url":51,"source":52,"tags":53},"https:\u002F\u002Fgithub.com\u002FONLYOFFICE\u002FDocumentServer","GitHub",[54],"Product",{"url":56,"source":52,"tags":57},"https:\u002F\u002Fgithub.com\u002FONLYOFFICE\u002Fcore",[54,58],"Vendor Advisory",{"url":60,"source":52,"tags":61},"https:\u002F\u002Fgithub.com\u002FONLYOFFICE\u002Fcore\u002Fblob\u002Fv5.6.4.13\u002FASCOfficePPTXFile\u002FEditor\u002FBinaryFileReaderWriter.cpp#L1918",[58],{"url":63,"source":52,"tags":64},"https:\u002F\u002Fgithub.com\u002FONLYOFFICE\u002Fcore\u002Fblob\u002Fv5.6.4.13\u002FASCOfficePPTXFile\u002FEditor\u002FBinaryFileReaderWriter.cpp#L241",[58],{"url":66,"source":52,"tags":67},"https:\u002F\u002Fgithub.com\u002FONLYOFFICE\u002Fcore\u002Fblob\u002Fv5.6.4.13\u002FASCOfficePPTXFile\u002FPPTXFormat\u002FLogic\u002FFills\u002FBlipFill.cpp#L328",[58],{"url":69,"source":52,"tags":70},"https:\u002F\u002Fgithub.com\u002Fmerrychap\u002Fpoc_exploits\u002Ftree\u002Fmaster\u002FONLYOFFICE\u002FCVE-2021-25831",[71,58],"Exploit",6,[74],{"id":75,"name":75,"description":76},"Unknown","NVD-CWE-noinfo",false,[],{"title":80,"metaDescription":81,"keywords":82,"canonicalUrl":83,"structuredData":84},"What is CVE-2021-25831? Vulnerability Analysis | Security Advisory | Precursor Intelligence","Comprehensive analysis of CVE-2021-25831, a critical severity cyber security vulnerability from 2021. A file extension handling issue was found in [core] mod...","CVE-2021-25831, CVE-2021-25831 vulnerability, CVE-2021-25831 security, critical severity vulnerability, cybersecurity, vulnerability analysis, security advisory, CVE database, threat intelligence, security research, vulnerability assessment, cyber threats, 2021, CVSS score, exploit, patch, remediation, onlyoffice security, document_server vulnerability","\u002Fwhat-is\u002Fcve-2021-25831",{"@context":85,"@type":86,"headline":80,"description":81,"datePublished":10,"dateModified":11,"author":87,"publisher":91,"about":95,"mainEntityOfPage":99,"articleSection":102,"keywords":103},"https:\u002F\u002Fschema.org","TechArticle",{"@type":88,"name":89,"url":90},"Organization","Precursor Intelligence","https:\u002F\u002Fprecursorintelligence.com",{"@type":88,"name":89,"url":90,"logo":92},{"@type":93,"url":94},"ImageObject","https:\u002F\u002Fprecursorintelligence.com\u002Fimg\u002Flogos\u002Feplogo.png",{"@type":96,"name":6,"description":97,"additionalType":98},"Thing","Cybersecurity Vulnerability","https:\u002F\u002Fschema.org\u002FSoftwareBug",{"@type":100,"@id":101},"WebPage","https:\u002F\u002Fprecursorintelligence.com\u002Fwhat-is\u002Fcve-2021-25831","Cybersecurity","CVE-2021-25831, CVE-2021-25831 vulnerability, CVE-2021-25831 security, critical severity vulnerability, cybersecurity, vulnerability analysis, security advisory, CVE database, threat intelligence, security research",[105],{"Operator":27,"Negate":27,"Nodes":106},[107],{"Operator":108,"Negate":27,"CPEMatch":109},"OR",[110],{"Vulnerable":4,"Criteria":47,"MatchCriteriaID":111,"VersionStartExcluding":27,"VersionStartIncluding":112,"VersionEndExcluding":27,"VersionEndIncluding":113},"076102C8-B582-4304-AD4E-0CDAE6DF191A","4.0.0-9","5.6.3",[],[],{"lastModified":11,"cacheTime":117,"version":33},1792326724001,{"score":119,"band":120,"action":121,"scoredAt":122},61,"Medium","Plan remediation","2026-10-16T06:50:35.047935+00:00"]