[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$f8Y9USeLTDp0L2GrT7T0UOxm-wd_3A2JbnPH-9OfvoPM":3,"g5a-risk:CVE-2021-34435":116},{"success":4,"data":5,"meta":114},true,{"cveId":6,"title":7,"description":8,"shortDescription":9,"publishedDate":10,"lastModified":11,"cvssScore":12,"cvssVector":13,"cvssMetrics":14,"epssScore":40,"epssPercentile":27,"epssTimeSeries":41,"severity":42,"affectedProducts":43,"affectedProductsCount":49,"references":50,"referencesCount":49,"weaknesses":58,"weaknessesCount":74,"isActivelyExploited":75,"cisaInfo":27,"otxData":27,"relatedBlogPosts":76,"seoMetadata":77,"configurations":102,"relatedVendorCves":112,"notableEvents":113},"CVE-2021-34435","What is CVE-2021-34435?","In Eclipse Theia 0.3.9 to 1.8.1, the \"mini-browser\" extension allows a user to preview HTML files in an iframe inside the IDE. But with the way it is made it is possible for a previewed HTML file to trigger an RCE. This exploit only happens if a user previews a malicious file..","In Eclipse Theia 0.3.9 to 1.8.1, the \"mini-browser\" extension allows a user to preview HTML files in an iframe inside the IDE. But with the way it is made it...","2021-09-01T18:15:09.107","2022-10-27T12:49:39.237",8.8,"CVSS:3.1\u002FAV:N\u002FAC:L\u002FPR:N\u002FUI:R\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":24,"Scope":25,"ConfidentialityImpact":26,"IntegrityImpact":26,"AvailabilityImpact":26,"BaseScore":12,"BaseSeverity":26,"ExploitCodeMaturity":27,"RemediationLevel":27,"ReportConfidence":27,"TemporalScore":27,"TemporalSeverity":27,"ConfidentialityRequirement":27,"IntegrityRequirement":27,"AvailabilityRequirement":26,"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","REQUIRED","UNCHANGED","HIGH",null,2.8,5.9,[31],{"Source":17,"Type":18,"CVSSData":32,"BaseSeverity":35,"ExploitabilityScore":38,"ImpactScore":39,"ACInsufInfo":27,"ObtainAllPrivilege":27,"ObtainUserPrivilege":27,"ObtainOtherPrivilege":27,"UserInteractionRequired":4},{"Version":33,"VectorString":34,"AccessVector":21,"AccessComplexity":35,"Authentication":23,"ConfidentialityImpact":36,"IntegrityImpact":36,"AvailabilityImpact":36,"BaseScore":37,"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:M\u002FAu:N\u002FC:P\u002FI:P\u002FA:P","MEDIUM","PARTIAL",6.8,8.6,6.4,0.00595,[40,40,40,40,40,40,40],"High",[44],{"vendor":45,"product":46,"version":47,"criteria":48,"vulnerable":4},"eclipse","theia","*","cpe:2.3:a:eclipse:theia:*:*:*:*:*:*:*:*",1,[51],{"url":52,"source":53,"tags":54},"https:\u002F\u002Fbugs.eclipse.org\u002Fbugs\u002Fshow_bug.cgi?id=568018","Eclipse",[55,56,57],"Exploit","Patch","Vendor Advisory",[59,67],{"id":60,"name":61,"description":62,"extendedDescription":63,"status":64,"abstraction":65,"structure":66},"CWE-346","Origin Validation Error","The product does not properly verify that the source of data or communication is valid.","","Draft","Class","Simple",{"id":68,"name":69,"description":70,"extendedDescription":71,"status":72,"abstraction":73,"structure":66},"CWE-942","Permissive Cross-domain Policy with Untrusted Domains","The product uses a cross-domain policy file that includes domains that should not be trusted.","A cross-domain policy file (\"crossdomain.xml\" in Flash and \"clientaccesspolicy.xml\" in Silverlight) defines a list of domains from which a server is allowed to make cross-domain requests. When making a cross-domain request, the Flash or Silverlight client will first look for the policy file on the target server. If it is found, and the domain hosting the application is explicitly allowed to make requests, the request is made.\nTherefore, if a cross-domain policy file includes domains that should not be trusted, such as when using wildcards, then the application could be attacked by these untrusted domains.\nAn overly permissive policy file allows many of the same attacks seen in Cross-Site Scripting (CWE-79). Once the user has executed a malicious Flash or Silverlight application, they are vulnerable to a variety of attacks. The attacker could transfer private information, such as cookies that may include session information, from the victim's machine to the attacker. The attacker could send malicious requests to a web site on behalf of the victim, which could be especially dangerous to the site if the victim has administrator privileges to manage that site.\nIn many cases, the attack can be launched without the victim even being aware of it.","Incomplete","Variant",2,false,[],{"title":78,"metaDescription":79,"keywords":80,"canonicalUrl":81,"structuredData":82},"What is CVE-2021-34435? Vulnerability Analysis | Security Advisory | Precursor Intelligence","Comprehensive analysis of CVE-2021-34435, a high severity cyber security vulnerability from 2021. In Eclipse Theia 0.3.9 to 1.8.1, the \"mini-browser\" extensi...","CVE-2021-34435, CVE-2021-34435 vulnerability, CVE-2021-34435 security, high severity vulnerability, cybersecurity, vulnerability analysis, security advisory, CVE database, threat intelligence, security research, vulnerability assessment, cyber threats, 2021, CVSS score, exploit, patch, remediation, eclipse security, theia vulnerability","\u002Fwhat-is\u002Fcve-2021-34435",{"@context":83,"@type":84,"headline":78,"description":79,"datePublished":10,"dateModified":11,"author":85,"publisher":89,"about":93,"mainEntityOfPage":97,"articleSection":100,"keywords":101},"https:\u002F\u002Fschema.org","TechArticle",{"@type":86,"name":87,"url":88},"Organization","Precursor Intelligence","https:\u002F\u002Fprecursorintelligence.com",{"@type":86,"name":87,"url":88,"logo":90},{"@type":91,"url":92},"ImageObject","https:\u002F\u002Fprecursorintelligence.com\u002Fimg\u002Flogos\u002Feplogo.png",{"@type":94,"name":6,"description":95,"additionalType":96},"Thing","Cybersecurity Vulnerability","https:\u002F\u002Fschema.org\u002FSoftwareBug",{"@type":98,"@id":99},"WebPage","https:\u002F\u002Fprecursorintelligence.com\u002Fwhat-is\u002Fcve-2021-34435","Cybersecurity","CVE-2021-34435, CVE-2021-34435 vulnerability, CVE-2021-34435 security, high severity vulnerability, cybersecurity, vulnerability analysis, security advisory, CVE database, threat intelligence, security research",[103],{"Operator":27,"Negate":27,"Nodes":104},[105],{"Operator":106,"Negate":27,"CPEMatch":107},"OR",[108],{"Vulnerable":4,"Criteria":48,"MatchCriteriaID":109,"VersionStartExcluding":27,"VersionStartIncluding":110,"VersionEndExcluding":27,"VersionEndIncluding":111},"74B580B6-DE9F-4241-A8BE-886D9771C955","0.3.9","1.8.1",[],[],{"lastModified":11,"cacheTime":115,"version":33},1792275689498,{"score":117,"band":118,"action":119,"scoredAt":120},53,"Medium","Plan remediation","2026-10-16T06:51:58.57861+00:00"]