[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fa6iDGwuxaM3_x9WFawmMu8UP0MSibz4daGWoLkOAXNc":3,"g5a-risk:CVE-2021-42785":104},{"success":4,"data":5,"meta":102},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":47,"references":48,"referencesCount":47,"weaknesses":55,"weaknessesCount":47,"isActivelyExploited":64,"cisaInfo":27,"otxData":27,"relatedBlogPosts":65,"seoMetadata":66,"configurations":91,"relatedVendorCves":100,"notableEvents":101},"CVE-2021-42785","What is CVE-2021-42785?","Buffer Overflow vulnerability in tvnviewer.exe of TightVNC Viewer allows a remote attacker to execute arbitrary instructions via a crafted FramebufferUpdate packet from a VNC server.","Buffer Overflow vulnerability in tvnviewer.exe of TightVNC Viewer allows a remote attacker to execute arbitrary instructions via a crafted FramebufferUpdate ...","2021-11-23T22:15:08.133","2021-11-29T14:23:43.43",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",7.5,10,6.4,0.02342,[39,39,39,39,39,39,39],"Critical",[43],{"vendor":44,"product":44,"version":45,"criteria":46,"vulnerable":4},"tightvnc","*","cpe:2.3:a:tightvnc:tightvnc:*:*:*:*:*:*:*:*",1,[49],{"url":50,"source":51,"tags":52},"https:\u002F\u002Fwww.tightvnc.com\u002Fwhatsnew.php","Tightvnc",[53,54],"Release Notes","Vendor Advisory",[56],{"id":57,"name":58,"description":59,"extendedDescription":60,"status":61,"abstraction":62,"structure":63},"CWE-120","Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')","The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow.","A buffer overflow condition exists when a product attempts to put more data in a buffer than it can hold, or when it attempts to put data in a memory area outside of the boundaries of a buffer. The simplest type of error, and the most common cause of buffer overflows, is the \"classic\" case in which the product copies the buffer without restricting how much is copied. Other variants exist, but the existence of a classic overflow strongly suggests that the programmer is not considering even the most basic of security protections.","Incomplete","Base","Simple",false,[],{"title":67,"metaDescription":68,"keywords":69,"canonicalUrl":70,"structuredData":71},"What is CVE-2021-42785? Vulnerability Analysis | Security Advisory | Precursor Intelligence","Comprehensive analysis of CVE-2021-42785, a critical severity cyber security vulnerability from 2021. Buffer Overflow vulnerability in tvnviewer.exe of Tight...","CVE-2021-42785, CVE-2021-42785 vulnerability, CVE-2021-42785 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, tightvnc security, tightvnc vulnerability","\u002Fwhat-is\u002Fcve-2021-42785",{"@context":72,"@type":73,"headline":67,"description":68,"datePublished":10,"dateModified":11,"author":74,"publisher":78,"about":82,"mainEntityOfPage":86,"articleSection":89,"keywords":90},"https:\u002F\u002Fschema.org","TechArticle",{"@type":75,"name":76,"url":77},"Organization","Precursor Intelligence","https:\u002F\u002Fprecursorintelligence.com",{"@type":75,"name":76,"url":77,"logo":79},{"@type":80,"url":81},"ImageObject","https:\u002F\u002Fprecursorintelligence.com\u002Fimg\u002Flogos\u002Feplogo.png",{"@type":83,"name":6,"description":84,"additionalType":85},"Thing","Cybersecurity Vulnerability","https:\u002F\u002Fschema.org\u002FSoftwareBug",{"@type":87,"@id":88},"WebPage","https:\u002F\u002Fprecursorintelligence.com\u002Fwhat-is\u002Fcve-2021-42785","Cybersecurity","CVE-2021-42785, CVE-2021-42785 vulnerability, CVE-2021-42785 security, critical severity vulnerability, cybersecurity, vulnerability analysis, security advisory, CVE database, threat intelligence, security research",[92],{"Operator":27,"Negate":27,"Nodes":93},[94],{"Operator":95,"Negate":27,"CPEMatch":96},"OR",[97],{"Vulnerable":4,"Criteria":46,"MatchCriteriaID":98,"VersionStartExcluding":27,"VersionStartIncluding":27,"VersionEndExcluding":27,"VersionEndIncluding":99},"E9227D38-8A36-4104-8703-77E0B93E1E43","2.8.59",[],[],{"lastModified":11,"cacheTime":103,"version":33},1792474586291,{"score":105,"band":106,"action":107,"scoredAt":108},54,"Medium","Plan remediation","2026-10-16T06:52:33.961894+00:00"]