[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fNoUz5rIDdlPk3KKeY5IJjRtJjzc26gq9qUlqPhFMPIA":3,"g5a-risk:CVE-2020-6819":153},{"success":4,"data":5,"meta":151},true,{"cveId":6,"title":7,"description":8,"shortDescription":9,"publishedDate":10,"lastModified":11,"cvssScore":12,"cvssVector":13,"cvssMetrics":14,"epssScore":45,"epssPercentile":25,"epssTimeSeries":46,"severity":47,"affectedProducts":48,"affectedProductsCount":57,"references":58,"referencesCount":90,"weaknesses":91,"weaknessesCount":57,"isActivelyExploited":4,"cisaInfo":106,"otxData":25,"relatedBlogPosts":107,"seoMetadata":108,"configurations":133,"relatedVendorCves":149,"notableEvents":150},"CVE-2020-6819","What is CVE-2020-6819?","Under certain conditions, when running the nsDocShell destructor, a race condition can cause a use-after-free. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Thunderbird \u003C 68.7.0, Firefox \u003C 74.0.1, and Firefox ESR \u003C 68.6.1.","Under certain conditions, when running the nsDocShell destructor, a race condition can cause a use-after-free. We are aware of targeted attacks in the wild a...","2020-04-24T16:15:13.37","2025-11-04T14:34:52.09",8.1,"CVSS:3.1\u002FAV:N\u002FAC:H\u002FPR:N\u002FUI:N\u002FS:U\u002FC:H\u002FI:H\u002FA:H",{"CVSSMetricV31":15,"CVSSMetricV30":32,"CVSSMetricV2":33,"CVSSMetricV40":25},[16,28],{"Source":17,"Type":18,"CVSSData":19,"ExploitabilityScore":26,"ImpactScore":27},"nvd@nist.gov","Primary",{"Version":20,"VectorString":13,"AttackVector":21,"AttackComplexity":22,"PrivilegesRequired":23,"UserInteraction":23,"Scope":24,"ConfidentialityImpact":22,"IntegrityImpact":22,"AvailabilityImpact":22,"BaseScore":12,"BaseSeverity":22,"ExploitCodeMaturity":25,"RemediationLevel":25,"ReportConfidence":25,"TemporalScore":25,"TemporalSeverity":25,"ConfidentialityRequirement":25,"IntegrityRequirement":25,"AvailabilityRequirement":25,"ModifiedAttackVector":25,"ModifiedAttackComplexity":25,"ModifiedPrivilegesRequired":25,"ModifiedUserInteraction":25,"ModifiedScope":25,"ModifiedConfidentialityImpact":25,"ModifiedIntegrityImpact":25,"ModifiedAvailabilityImpact":25,"EnvironmentalScore":25,"EnvironmentalSeverity":25},"3.1","NETWORK","HIGH","NONE","UNCHANGED",null,2.2,5.9,{"Source":29,"Type":30,"CVSSData":31,"ExploitabilityScore":26,"ImpactScore":27},"134c704f-9b21-4f2e-91b3-4a467353bcc0","Secondary",{"Version":20,"VectorString":13,"AttackVector":21,"AttackComplexity":22,"PrivilegesRequired":23,"UserInteraction":23,"Scope":24,"ConfidentialityImpact":22,"IntegrityImpact":22,"AvailabilityImpact":22,"BaseScore":12,"BaseSeverity":22,"ExploitCodeMaturity":25,"RemediationLevel":25,"ReportConfidence":25,"TemporalScore":25,"TemporalSeverity":25,"ConfidentialityRequirement":25,"IntegrityRequirement":25,"AvailabilityRequirement":25,"ModifiedAttackVector":25,"ModifiedAttackComplexity":25,"ModifiedPrivilegesRequired":25,"ModifiedUserInteraction":25,"ModifiedScope":25,"ModifiedConfidentialityImpact":25,"ModifiedIntegrityImpact":25,"ModifiedAvailabilityImpact":25,"EnvironmentalScore":25,"EnvironmentalSeverity":25},[],[34],{"Source":17,"Type":18,"CVSSData":35,"BaseSeverity":38,"ExploitabilityScore":42,"ImpactScore":43,"ACInsufInfo":44,"ObtainAllPrivilege":44,"ObtainUserPrivilege":44,"ObtainOtherPrivilege":44,"UserInteractionRequired":44},{"Version":36,"VectorString":37,"AccessVector":21,"AccessComplexity":38,"Authentication":23,"ConfidentialityImpact":39,"IntegrityImpact":39,"AvailabilityImpact":39,"BaseScore":40,"BaseSeverity":41,"Exploitability":25,"RemediationLevel":25,"ReportConfidence":25,"TemporalScore":25,"CollateralDamagePotential":25,"TargetDistribution":25,"ConfidentialityRequirement":25,"IntegrityRequirement":25,"AvailabilityRequirement":25,"EnvironmentalScore":25},"2.0","AV:N\u002FAC:M\u002FAu:N\u002FC:P\u002FI:P\u002FA:P","MEDIUM","PARTIAL",6.8,"",8.6,6.4,false,0.03039,[45,45,45,45,45,45,45],"High",[49,54],{"vendor":50,"product":51,"version":52,"criteria":53,"vulnerable":4},"mozilla","firefox","*","cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*",{"vendor":50,"product":55,"version":52,"criteria":56,"vulnerable":4},"thunderbird","cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*",2,[59,65,70,74,77,79,81,83,85],{"url":60,"source":61,"tags":62},"https:\u002F\u002Fbugzilla.mozilla.org\u002Fshow_bug.cgi?id=1620818","Mozilla",[63,64],"Exploit","Issue Tracking",{"url":66,"source":67,"tags":68},"https:\u002F\u002Fusn.ubuntu.com\u002F4335-1\u002F","Ubuntu",[69],"Third Party Advisory",{"url":71,"source":61,"tags":72},"https:\u002F\u002Fwww.mozilla.org\u002Fsecurity\u002Fadvisories\u002Fmfsa2020-11\u002F",[73],"Vendor Advisory",{"url":75,"source":61,"tags":76},"https:\u002F\u002Fwww.mozilla.org\u002Fsecurity\u002Fadvisories\u002Fmfsa2020-14\u002F",[73],{"url":60,"source":61,"tags":78},[63,64],{"url":66,"source":67,"tags":80},[69],{"url":71,"source":61,"tags":82},[73],{"url":75,"source":61,"tags":84},[73],{"url":86,"source":87,"tags":88},"https:\u002F\u002Fwww.cisa.gov\u002Fknown-exploited-vulnerabilities-catalog?field_cve=CVE-2020-6819","CISA",[89],"US Government Resource",9,[92,99],{"id":93,"name":94,"description":95,"extendedDescription":41,"status":96,"abstraction":97,"structure":98},"CWE-416","Use After Free","The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory \"belongs\" to the code that operates on the new pointer.","Stable","Variant","Simple",{"id":100,"name":101,"description":102,"extendedDescription":103,"status":104,"abstraction":105,"structure":98},"CWE-362","Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')","The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently.","This can have security implications when the expected synchronization is in security-critical code, such as recording whether a user is authenticated or modifying important state information that should not be influenced by an outsider.\nA race condition occurs within concurrent environments, and is effectively a property of a code sequence. Depending on the context, a code sequence may be in the form of a function call, a small number of instructions, a series of program invocations, etc.\nA race condition violates these properties, which are closely related:\nA race condition exists when an \"interfering code sequence\" can still access the shared resource, violating exclusivity. Programmers may assume that certain code sequences execute too quickly to be affected by an interfering code sequence; when they are not, this violates atomicity. For example, the single \"x++\" statement may appear atomic at the code layer, but it is actually non-atomic at the instruction layer, since it involves a read (the original value of x), followed by a computation (x+1), followed by a write (save the result to x).\nThe interfering code sequence could be \"trusted\" or \"untrusted.\" A trusted interfering code sequence occurs within the product; it cannot be modified by the attacker, and it can only be invoked indirectly. An untrusted interfering code sequence can be authored directly by the attacker, and typically it is external to the vulnerable product.","Draft","Class",{"shortDescription":41,"requiredAction":41,"vulnerabilityName":41,"dateAdded":25},[],{"title":109,"metaDescription":110,"keywords":111,"canonicalUrl":112,"structuredData":113},"What is CVE-2020-6819? Vulnerability Analysis | Security Advisory | Precursor Intelligence","Comprehensive analysis of CVE-2020-6819, a high severity cyber security vulnerability from 2020. Under certain conditions, when running the nsDocShell destru...","CVE-2020-6819, CVE-2020-6819 vulnerability, CVE-2020-6819 security, high severity vulnerability, cybersecurity, vulnerability analysis, security advisory, CVE database, threat intelligence, security research, vulnerability assessment, cyber threats, 2020, CVSS score, exploit, patch, remediation, mozilla security, firefox vulnerability, thunderbird vulnerability","\u002Fwhat-is\u002Fcve-2020-6819",{"@context":114,"@type":115,"headline":109,"description":110,"datePublished":10,"dateModified":11,"author":116,"publisher":120,"about":124,"mainEntityOfPage":128,"articleSection":131,"keywords":132},"https:\u002F\u002Fschema.org","TechArticle",{"@type":117,"name":118,"url":119},"Organization","Precursor Intelligence","https:\u002F\u002Fprecursorintelligence.com",{"@type":117,"name":118,"url":119,"logo":121},{"@type":122,"url":123},"ImageObject","https:\u002F\u002Fprecursorintelligence.com\u002Fimg\u002Flogos\u002Feplogo.png",{"@type":125,"name":6,"description":126,"additionalType":127},"Thing","Cybersecurity Vulnerability","https:\u002F\u002Fschema.org\u002FSoftwareBug",{"@type":129,"@id":130},"WebPage","https:\u002F\u002Fprecursorintelligence.com\u002Fwhat-is\u002Fcve-2020-6819","Cybersecurity","CVE-2020-6819, CVE-2020-6819 vulnerability, CVE-2020-6819 security, high severity vulnerability, cybersecurity, vulnerability analysis, security advisory, CVE database, threat intelligence, security research",[134],{"Operator":25,"Negate":25,"Nodes":135},[136],{"Operator":137,"Negate":44,"CPEMatch":138},"OR",[139,142,146],{"Vulnerable":4,"Criteria":53,"MatchCriteriaID":140,"VersionStartExcluding":25,"VersionStartIncluding":25,"VersionEndExcluding":141,"VersionEndIncluding":25},"A733A9CB-A031-4A8A-9580-8E262B6956B1","68.6.1",{"Vulnerable":4,"Criteria":143,"MatchCriteriaID":144,"VersionStartExcluding":25,"VersionStartIncluding":25,"VersionEndExcluding":145,"VersionEndIncluding":25},"cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*","420A3EDF-5443-45D9-BF32-FA964184832A","74.0.1",{"Vulnerable":4,"Criteria":56,"MatchCriteriaID":147,"VersionStartExcluding":25,"VersionStartIncluding":25,"VersionEndExcluding":148,"VersionEndIncluding":25},"CF7AEB5A-A52E-45E7-AFBF-546C351A4915","68.7.0",[],[],{"lastModified":11,"cacheTime":152,"version":36},1792353275728,{"score":154,"band":47,"action":155,"scoredAt":156},75,"Emergency patch","2026-10-16T06:48:32.99091+00:00"]