[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fcVfHNdHmhMlFX9t3Mbpd5gbFW4LbXxf8fnyn6-YG0vQ":3,"g5a-risk:CVE-2021-40083":105},{"success":4,"data":5,"meta":103},true,{"cveId":6,"title":7,"description":8,"shortDescription":9,"publishedDate":10,"lastModified":11,"cvssScore":12,"cvssVector":13,"cvssMetrics":14,"epssScore":39,"epssPercentile":26,"epssTimeSeries":40,"severity":41,"affectedProducts":42,"affectedProductsCount":48,"references":49,"referencesCount":48,"weaknesses":56,"weaknessesCount":48,"isActivelyExploited":65,"cisaInfo":26,"otxData":26,"relatedBlogPosts":66,"seoMetadata":67,"configurations":92,"relatedVendorCves":101,"notableEvents":102},"CVE-2021-40083","What is CVE-2021-40083?","Knot Resolver before 5.3.2 is prone to an assertion failure, triggerable by a remote attacker in an edge case (NSEC3 with too many iterations used for a positive wildcard proof).","Knot Resolver before 5.3.2 is prone to an assertion failure, triggerable by a remote attacker in an edge case (NSEC3 with too many iterations used for a posi...","2021-08-25T01:15:11.087","2021-08-30T19:29:47.037",7.5,"CVSS:3.1\u002FAV:N\u002FAC:L\u002FPR:N\u002FUI:N\u002FS:U\u002FC:N\u002FI:N\u002FA:H",{"CVSSMetricV31":15,"CVSSMetricV30":26,"CVSSMetricV2":29,"CVSSMetricV40":26},[16],{"Source":17,"Type":18,"CVSSData":19,"ExploitabilityScore":27,"ImpactScore":28},"nvd@nist.gov","Primary",{"Version":20,"VectorString":13,"AttackVector":21,"AttackComplexity":22,"PrivilegesRequired":23,"UserInteraction":23,"Scope":24,"ConfidentialityImpact":23,"IntegrityImpact":23,"AvailabilityImpact":25,"BaseScore":12,"BaseSeverity":25,"ExploitCodeMaturity":26,"RemediationLevel":26,"ReportConfidence":26,"TemporalScore":26,"TemporalSeverity":26,"ConfidentialityRequirement":26,"IntegrityRequirement":26,"AvailabilityRequirement":25,"ModifiedAttackVector":26,"ModifiedAttackComplexity":26,"ModifiedPrivilegesRequired":26,"ModifiedUserInteraction":26,"ModifiedScope":26,"ModifiedConfidentialityImpact":26,"ModifiedIntegrityImpact":26,"ModifiedAvailabilityImpact":26,"EnvironmentalScore":26,"EnvironmentalSeverity":26},"3.1","NETWORK","LOW","NONE","UNCHANGED","HIGH",null,3.9,3.6,[30],{"Source":17,"Type":18,"CVSSData":31,"BaseSeverity":36,"ExploitabilityScore":37,"ImpactScore":38,"ACInsufInfo":26,"ObtainAllPrivilege":26,"ObtainUserPrivilege":26,"ObtainOtherPrivilege":26,"UserInteractionRequired":26},{"Version":32,"VectorString":33,"AccessVector":21,"AccessComplexity":22,"Authentication":23,"ConfidentialityImpact":23,"IntegrityImpact":23,"AvailabilityImpact":34,"BaseScore":35,"BaseSeverity":26,"Exploitability":26,"RemediationLevel":26,"ReportConfidence":26,"TemporalScore":26,"CollateralDamagePotential":26,"TargetDistribution":26,"ConfidentialityRequirement":26,"IntegrityRequirement":26,"AvailabilityRequirement":26,"EnvironmentalScore":26},"2.0","AV:N\u002FAC:L\u002FAu:N\u002FC:N\u002FI:N\u002FA:P","PARTIAL",5,"MEDIUM",10,2.9,0.01421,[39,39,39,39,39,39,39],"High",[43],{"vendor":44,"product":45,"version":46,"criteria":47,"vulnerable":4},"nic","knot_resolver","*","cpe:2.3:a:nic:knot_resolver:*:*:*:*:*:*:*:*",1,[50],{"url":51,"source":52,"tags":53},"https:\u002F\u002Fgitlab.nic.cz\u002Fknot\u002Fknot-resolver\u002F-\u002Fmerge_requests\u002F1169","Nic",[54,55],"Patch","Third Party Advisory",[57],{"id":58,"name":59,"description":60,"extendedDescription":61,"status":62,"abstraction":63,"structure":64},"CWE-617","Reachable Assertion","The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.","While assertion is good for catching logic errors and reducing the chances of reaching more serious vulnerability conditions, it can still lead to a denial of service.\nFor example, if a server handles multiple simultaneous connections, and an assert() occurs in one single connection that causes all other connections to be dropped, this is a reachable assertion that leads to a denial of service.","Draft","Base","Simple",false,[],{"title":68,"metaDescription":69,"keywords":70,"canonicalUrl":71,"structuredData":72},"What is CVE-2021-40083? Vulnerability Analysis | Security Advisory | Precursor Intelligence","Comprehensive analysis of CVE-2021-40083, a high severity cyber security vulnerability from 2021. Knot Resolver before 5.3.2 is prone to an assertion failure...","CVE-2021-40083, CVE-2021-40083 vulnerability, CVE-2021-40083 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, nic security, knot_resolver vulnerability","\u002Fwhat-is\u002Fcve-2021-40083",{"@context":73,"@type":74,"headline":68,"description":69,"datePublished":10,"dateModified":11,"author":75,"publisher":79,"about":83,"mainEntityOfPage":87,"articleSection":90,"keywords":91},"https:\u002F\u002Fschema.org","TechArticle",{"@type":76,"name":77,"url":78},"Organization","Precursor Intelligence","https:\u002F\u002Fprecursorintelligence.com",{"@type":76,"name":77,"url":78,"logo":80},{"@type":81,"url":82},"ImageObject","https:\u002F\u002Fprecursorintelligence.com\u002Fimg\u002Flogos\u002Feplogo.png",{"@type":84,"name":6,"description":85,"additionalType":86},"Thing","Cybersecurity Vulnerability","https:\u002F\u002Fschema.org\u002FSoftwareBug",{"@type":88,"@id":89},"WebPage","https:\u002F\u002Fprecursorintelligence.com\u002Fwhat-is\u002Fcve-2021-40083","Cybersecurity","CVE-2021-40083, CVE-2021-40083 vulnerability, CVE-2021-40083 security, high severity vulnerability, cybersecurity, vulnerability analysis, security advisory, CVE database, threat intelligence, security research",[93],{"Operator":26,"Negate":26,"Nodes":94},[95],{"Operator":96,"Negate":26,"CPEMatch":97},"OR",[98],{"Vulnerable":4,"Criteria":47,"MatchCriteriaID":99,"VersionStartExcluding":26,"VersionStartIncluding":26,"VersionEndExcluding":100,"VersionEndIncluding":26},"D0332FE7-D275-4C68-BCFC-CF71A159E210","5.3.2",[],[],{"lastModified":11,"cacheTime":104,"version":32},1792338800805,{"score":106,"band":107,"action":108,"scoredAt":109},46,"Medium","Plan remediation","2026-10-16T06:51:55.010031+00:00"]