[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$funkdr_L_xCjuROzRFdAszEko_Q3sO3jP7IFfXB_GIDE":3,"g5a-risk:CVE-2021-31166":135},{"success":4,"data":5,"meta":133},true,{"cveId":6,"title":7,"description":8,"shortDescription":8,"publishedDate":9,"lastModified":10,"cvssScore":11,"cvssVector":12,"cvssMetrics":13,"epssScore":42,"epssPercentile":26,"epssTimeSeries":43,"severity":44,"affectedProducts":45,"affectedProductsCount":60,"references":61,"referencesCount":60,"weaknesses":78,"weaknessesCount":87,"isActivelyExploited":4,"cisaInfo":88,"otxData":26,"relatedBlogPosts":89,"seoMetadata":90,"configurations":115,"relatedVendorCves":131,"notableEvents":132},"CVE-2021-31166","What is CVE-2021-31166?","HTTP Protocol Stack Remote Code Execution Vulnerability","2021-05-11T19:15:09.3","2025-03-13T16:41:41.717",9.8,"CVSS:3.1\u002FAV:N\u002FAC:L\u002FPR:N\u002FUI:N\u002FS:U\u002FC:H\u002FI:H\u002FA:H",{"CVSSMetricV31":14,"CVSSMetricV30":26,"CVSSMetricV2":32,"CVSSMetricV40":26},[15,29],{"Source":16,"Type":17,"CVSSData":18,"ExploitabilityScore":27,"ImpactScore":28},"secure@microsoft.com","Secondary",{"Version":19,"VectorString":12,"AttackVector":20,"AttackComplexity":21,"PrivilegesRequired":22,"UserInteraction":22,"Scope":23,"ConfidentialityImpact":24,"IntegrityImpact":24,"AvailabilityImpact":24,"BaseScore":11,"BaseSeverity":25,"ExploitCodeMaturity":26,"RemediationLevel":26,"ReportConfidence":26,"TemporalScore":26,"TemporalSeverity":26,"ConfidentialityRequirement":26,"IntegrityRequirement":26,"AvailabilityRequirement":24,"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","CRITICAL",null,3.9,5.9,{"Source":30,"Type":17,"CVSSData":31,"ExploitabilityScore":27,"ImpactScore":28},"nvd@nist.gov",{"Version":19,"VectorString":12,"AttackVector":20,"AttackComplexity":21,"PrivilegesRequired":22,"UserInteraction":22,"Scope":23,"ConfidentialityImpact":24,"IntegrityImpact":24,"AvailabilityImpact":24,"BaseScore":11,"BaseSeverity":25,"ExploitCodeMaturity":26,"RemediationLevel":26,"ReportConfidence":26,"TemporalScore":26,"TemporalSeverity":26,"ConfidentialityRequirement":26,"IntegrityRequirement":26,"AvailabilityRequirement":24,"ModifiedAttackVector":26,"ModifiedAttackComplexity":26,"ModifiedPrivilegesRequired":26,"ModifiedUserInteraction":26,"ModifiedScope":26,"ModifiedConfidentialityImpact":26,"ModifiedIntegrityImpact":26,"ModifiedAvailabilityImpact":26,"EnvironmentalScore":26,"EnvironmentalSeverity":26},[33],{"Source":30,"Type":34,"CVSSData":35,"BaseSeverity":24,"ExploitabilityScore":40,"ImpactScore":41,"ACInsufInfo":26,"ObtainAllPrivilege":26,"ObtainUserPrivilege":26,"ObtainOtherPrivilege":26,"UserInteractionRequired":26},"Primary",{"Version":36,"VectorString":37,"AccessVector":20,"AccessComplexity":21,"Authentication":22,"ConfidentialityImpact":38,"IntegrityImpact":38,"AvailabilityImpact":38,"BaseScore":39,"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:P\u002FI:P\u002FA:P","PARTIAL",7.5,10,6.4,0.99867,[42,42,42,42,42,42,42],"Critical",[46,51,54,57],{"vendor":47,"product":48,"version":49,"criteria":50,"vulnerable":4},"microsoft","windows_10_2004","*","cpe:2.3:o:microsoft:windows_10_2004:*:*:*:*:*:*:*:*",{"vendor":47,"product":52,"version":49,"criteria":53,"vulnerable":4},"windows_10_20h2","cpe:2.3:o:microsoft:windows_10_20h2:*:*:*:*:*:*:*:*",{"vendor":47,"product":55,"version":49,"criteria":56,"vulnerable":4},"windows_server_2004","cpe:2.3:o:microsoft:windows_server_2004:*:*:*:*:*:*:*:*",{"vendor":47,"product":58,"version":49,"criteria":59,"vulnerable":4},"windows_server_20h2","cpe:2.3:o:microsoft:windows_server_20h2:*:*:*:*:*:*:*:*",4,[62,68,74,76],{"url":63,"source":64,"tags":65},"http:\u002F\u002Fpacketstormsecurity.com\u002Ffiles\u002F162722\u002FMicrosoft-HTTP-Protocol-Stack-Remote-Code-Execution.html","Packetstormsecurity",[66,67],"Third Party Advisory","VDB Entry",{"url":69,"source":70,"tags":71},"https:\u002F\u002Fportal.msrc.microsoft.com\u002Fen-US\u002Fsecurity-guidance\u002Fadvisory\u002FCVE-2021-31166","Microsoft",[72,73],"Patch","Vendor Advisory",{"url":63,"source":64,"tags":75},[66,67],{"url":69,"source":70,"tags":77},[72,73],[79],{"id":80,"name":81,"description":82,"extendedDescription":83,"status":84,"abstraction":85,"structure":86},"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",1,{"shortDescription":83,"requiredAction":83,"vulnerabilityName":83,"dateAdded":26},[],{"title":91,"metaDescription":92,"keywords":93,"canonicalUrl":94,"structuredData":95},"What is CVE-2021-31166? Vulnerability Analysis | Security Advisory | Precursor Intelligence","Comprehensive analysis of CVE-2021-31166, a critical severity cyber security vulnerability from 2021. High exploit probability (99.9%). HTTP Protocol Stack R...","CVE-2021-31166, CVE-2021-31166 vulnerability, CVE-2021-31166 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, microsoft security, windows_10_2004 vulnerability, windows_10_20h2 vulnerability, windows_server_2004 vulnerability, windows_server_20h2 vulnerability, high risk vulnerability, actively exploited, exploit available","\u002Fwhat-is\u002Fcve-2021-31166",{"@context":96,"@type":97,"headline":91,"description":92,"datePublished":9,"dateModified":10,"author":98,"publisher":102,"about":106,"mainEntityOfPage":110,"articleSection":113,"keywords":114},"https:\u002F\u002Fschema.org","TechArticle",{"@type":99,"name":100,"url":101},"Organization","Precursor Intelligence","https:\u002F\u002Fprecursorintelligence.com",{"@type":99,"name":100,"url":101,"logo":103},{"@type":104,"url":105},"ImageObject","https:\u002F\u002Fprecursorintelligence.com\u002Fimg\u002Flogos\u002Feplogo.png",{"@type":107,"name":6,"description":108,"additionalType":109},"Thing","Cybersecurity Vulnerability","https:\u002F\u002Fschema.org\u002FSoftwareBug",{"@type":111,"@id":112},"WebPage","https:\u002F\u002Fprecursorintelligence.com\u002Fwhat-is\u002Fcve-2021-31166","Cybersecurity","CVE-2021-31166, CVE-2021-31166 vulnerability, CVE-2021-31166 security, critical severity vulnerability, cybersecurity, vulnerability analysis, security advisory, CVE database, threat intelligence, security research",[116],{"Operator":26,"Negate":26,"Nodes":117},[118],{"Operator":119,"Negate":26,"CPEMatch":120},"OR",[121,124,127,129],{"Vulnerable":4,"Criteria":50,"MatchCriteriaID":122,"VersionStartExcluding":26,"VersionStartIncluding":26,"VersionEndExcluding":123,"VersionEndIncluding":26},"F170C517-0312-457D-9108-ECA6638C8223","10.0.19041.982",{"Vulnerable":4,"Criteria":53,"MatchCriteriaID":125,"VersionStartExcluding":26,"VersionStartIncluding":26,"VersionEndExcluding":126,"VersionEndIncluding":26},"957F366C-FD59-479A-A6C5-F93E35436549","10.0.19042.982",{"Vulnerable":4,"Criteria":56,"MatchCriteriaID":128,"VersionStartExcluding":26,"VersionStartIncluding":26,"VersionEndExcluding":123,"VersionEndIncluding":26},"BD0A39ED-F4B4-4C2D-BDB4-088426F2377B",{"Vulnerable":4,"Criteria":59,"MatchCriteriaID":130,"VersionStartExcluding":26,"VersionStartIncluding":26,"VersionEndExcluding":126,"VersionEndIncluding":26},"F42A77A0-2B44-4C08-8BBB-851B22AED6E8",[],[],{"lastModified":10,"cacheTime":134,"version":36},1792252757395,{"score":136,"band":44,"action":137,"scoredAt":138},86,"Emergency patch","2026-10-16T06:51:06.485411+00:00"]