[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fyV5edpTlRskU0mABOsj9TyJdc26XUSWlvEJ1r79Gzps":3,"g5a-risk:CVE-2021-34749":147},{"success":4,"data":5,"meta":145},true,{"cveId":6,"title":7,"description":8,"shortDescription":9,"publishedDate":10,"lastModified":11,"cvssScore":12,"cvssVector":13,"cvssMetrics":14,"epssScore":46,"epssPercentile":26,"epssTimeSeries":47,"severity":48,"affectedProducts":49,"affectedProductsCount":72,"references":73,"referencesCount":87,"weaknesses":88,"weaknessesCount":97,"isActivelyExploited":98,"cisaInfo":26,"otxData":26,"relatedBlogPosts":99,"seoMetadata":100,"configurations":125,"relatedVendorCves":143,"notableEvents":144},"CVE-2021-34749","What is CVE-2021-34749?","A vulnerability in Server Name Identification (SNI) request filtering of Cisco Web Security Appliance (WSA), Cisco Firepower Threat Defense (FTD), and the Snort detection engine could allow an unauthenticated, remote attacker to bypass filtering technology on an affected device and exfiltrate data from a compromised host. This vulnerability is due to inadequate filtering of the SSL handshake. An attacker could exploit this vulnerability by using data from the SSL client hello packet to communicate with an external server. A successful exploit could allow the attacker to execute a command-and-control attack on a compromised host and perform additional data exfiltration attacks.","A vulnerability in Server Name Identification (SNI) request filtering of Cisco Web Security Appliance (WSA), Cisco Firepower Threat Defense (FTD), and the Sn...","2021-08-18T20:15:07.93","2023-11-07T03:36:18.51",8.6,"CVSS:3.1\u002FAV:N\u002FAC:L\u002FPR:N\u002FUI:N\u002FS:C\u002FC:N\u002FI:H\u002FA:N",{"CVSSMetricV31":15,"CVSSMetricV30":26,"CVSSMetricV2":37,"CVSSMetricV40":26},[16,29],{"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":25,"AvailabilityImpact":23,"BaseScore":12,"BaseSeverity":25,"ExploitCodeMaturity":26,"RemediationLevel":26,"ReportConfidence":26,"TemporalScore":26,"TemporalSeverity":26,"ConfidentialityRequirement":26,"IntegrityRequirement":26,"AvailabilityRequirement":23,"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","CHANGED","HIGH",null,3.9,4,{"Source":30,"Type":31,"CVSSData":32,"ExploitabilityScore":27,"ImpactScore":36},"d1c1063e-7a18-46af-9102-31f8928bc633","Secondary",{"Version":20,"VectorString":33,"AttackVector":21,"AttackComplexity":22,"PrivilegesRequired":23,"UserInteraction":23,"Scope":24,"ConfidentialityImpact":23,"IntegrityImpact":22,"AvailabilityImpact":23,"BaseScore":34,"BaseSeverity":35,"ExploitCodeMaturity":26,"RemediationLevel":26,"ReportConfidence":26,"TemporalScore":26,"TemporalSeverity":26,"ConfidentialityRequirement":26,"IntegrityRequirement":26,"AvailabilityRequirement":23,"ModifiedAttackVector":26,"ModifiedAttackComplexity":26,"ModifiedPrivilegesRequired":26,"ModifiedUserInteraction":26,"ModifiedScope":26,"ModifiedConfidentialityImpact":26,"ModifiedIntegrityImpact":26,"ModifiedAvailabilityImpact":26,"EnvironmentalScore":26,"EnvironmentalSeverity":26},"CVSS:3.1\u002FAV:N\u002FAC:L\u002FPR:N\u002FUI:N\u002FS:C\u002FC:N\u002FI:L\u002FA:N",5.8,"MEDIUM",1.4,[38],{"Source":17,"Type":18,"CVSSData":39,"BaseSeverity":35,"ExploitabilityScore":44,"ImpactScore":45,"ACInsufInfo":26,"ObtainAllPrivilege":26,"ObtainUserPrivilege":26,"ObtainOtherPrivilege":26,"UserInteractionRequired":26},{"Version":40,"VectorString":41,"AccessVector":21,"AccessComplexity":22,"Authentication":23,"ConfidentialityImpact":23,"IntegrityImpact":42,"AvailabilityImpact":23,"BaseScore":43,"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:P\u002FA:N","PARTIAL",5,10,2.9,0.01684,[46,46,46,46,46,46,46],"High",[50,55,59,63,66,69],{"vendor":51,"product":52,"version":53,"criteria":54,"vulnerable":4},"cisco","firepower_management_center","2.9.18","cpe:2.3:a:cisco:firepower_management_center:2.9.18:*:*:*:*:*:*:*",{"vendor":51,"product":56,"version":57,"criteria":58,"vulnerable":4},"ironport_web_security_appliance","14.5","cpe:2.3:a:cisco:ironport_web_security_appliance:14.5:*:*:*:*:*:*:*",{"vendor":51,"product":60,"version":61,"criteria":62,"vulnerable":4},"firepower_management_center_virtual_appliance_firmware","6.6.0","cpe:2.3:o:cisco:firepower_management_center_virtual_appliance_firmware:6.6.0:*:*:*:*:*:*:*",{"vendor":51,"product":60,"version":64,"criteria":65,"vulnerable":4},"6.7.0","cpe:2.3:o:cisco:firepower_management_center_virtual_appliance_firmware:6.7.0:*:*:*:*:*:*:*",{"vendor":51,"product":60,"version":67,"criteria":68,"vulnerable":4},"7.0.0","cpe:2.3:o:cisco:firepower_management_center_virtual_appliance_firmware:7.0.0:*:*:*:*:*:*:*",{"vendor":51,"product":60,"version":70,"criteria":71,"vulnerable":4},"7.1.0","cpe:2.3:o:cisco:firepower_management_center_virtual_appliance_firmware:7.1.0:*:*:*:*:*:*:*",6,[74,78,84],{"url":75,"source":76,"tags":77},"https:\u002F\u002Flists.debian.org\u002Fdebian-lts-announce\u002F2023\u002F02\u002Fmsg00011.html","Debian",[],{"url":79,"source":80,"tags":81},"https:\u002F\u002Ftools.cisco.com\u002Fsecurity\u002Fcenter\u002Fcontent\u002FCiscoSecurityAdvisory\u002Fcisco-sa-sni-data-exfil-mFgzXqLN","Cisco",[82,83],"Patch","Vendor Advisory",{"url":85,"source":76,"tags":86},"https:\u002F\u002Fwww.debian.org\u002Fsecurity\u002F2023\u002Fdsa-5354",[],3,[89],{"id":90,"name":91,"description":92,"extendedDescription":93,"status":94,"abstraction":95,"structure":96},"CWE-200","Exposure of Sensitive Information to an Unauthorized Actor","The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.","There are many different kinds of mistakes that introduce information exposures. The severity of the error can range widely, depending on the context in which the product operates, the type of sensitive information that is revealed, and the benefits it may provide to an attacker.  Some kinds of sensitive information include:\nInformation might be sensitive to different parties, each of which may have their own expectations for whether the information should be protected.  These parties include:\nInformation exposures can occur in different ways:\nIt is common practice to describe any loss of confidentiality as an \"information exposure,\" but this can lead to overuse of CWE-200 in CWE mapping. From the CWE perspective, loss of confidentiality is a technical impact that can arise from dozens of different weaknesses, such as insecure file permissions or out-of-bounds read.  CWE-200 and its lower-level descendants are intended to cover the mistakes that occur in behaviors that explicitly manage, store, transfer, or cleanse sensitive information.","Draft","Class","Simple",1,false,[],{"title":101,"metaDescription":102,"keywords":103,"canonicalUrl":104,"structuredData":105},"What is CVE-2021-34749? Vulnerability Analysis | Security Advisory | Precursor Intelligence","Comprehensive analysis of CVE-2021-34749, a high severity cyber security vulnerability from 2021. A vulnerability in Server Name Identification (SNI) request...","CVE-2021-34749, CVE-2021-34749 vulnerability, CVE-2021-34749 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, cisco security, firepower_management_center vulnerability, ironport_web_security_appliance vulnerability, firepower_management_center_virtual_appliance_firmware vulnerability","\u002Fwhat-is\u002Fcve-2021-34749",{"@context":106,"@type":107,"headline":101,"description":102,"datePublished":10,"dateModified":11,"author":108,"publisher":112,"about":116,"mainEntityOfPage":120,"articleSection":123,"keywords":124},"https:\u002F\u002Fschema.org","TechArticle",{"@type":109,"name":110,"url":111},"Organization","Precursor Intelligence","https:\u002F\u002Fprecursorintelligence.com",{"@type":109,"name":110,"url":111,"logo":113},{"@type":114,"url":115},"ImageObject","https:\u002F\u002Fprecursorintelligence.com\u002Fimg\u002Flogos\u002Feplogo.png",{"@type":117,"name":6,"description":118,"additionalType":119},"Thing","Cybersecurity Vulnerability","https:\u002F\u002Fschema.org\u002FSoftwareBug",{"@type":121,"@id":122},"WebPage","https:\u002F\u002Fprecursorintelligence.com\u002Fwhat-is\u002Fcve-2021-34749","Cybersecurity","CVE-2021-34749, CVE-2021-34749 vulnerability, CVE-2021-34749 security, high severity vulnerability, cybersecurity, vulnerability analysis, security advisory, CVE database, threat intelligence, security research",[126],{"Operator":26,"Negate":26,"Nodes":127},[128],{"Operator":129,"Negate":26,"CPEMatch":130},"OR",[131,133,135,137,139,141],{"Vulnerable":4,"Criteria":54,"MatchCriteriaID":132,"VersionStartExcluding":26,"VersionStartIncluding":26,"VersionEndExcluding":26,"VersionEndIncluding":26},"5C8E9BF1-2B66-419E-B4C2-5D605BF459EC",{"Vulnerable":4,"Criteria":58,"MatchCriteriaID":134,"VersionStartExcluding":26,"VersionStartIncluding":26,"VersionEndExcluding":26,"VersionEndIncluding":26},"4016409A-673A-43E8-AE5F-DE6088CC35B3",{"Vulnerable":4,"Criteria":62,"MatchCriteriaID":136,"VersionStartExcluding":26,"VersionStartIncluding":26,"VersionEndExcluding":26,"VersionEndIncluding":26},"86D052F5-7C8C-4012-A820-0182DA058585",{"Vulnerable":4,"Criteria":65,"MatchCriteriaID":138,"VersionStartExcluding":26,"VersionStartIncluding":26,"VersionEndExcluding":26,"VersionEndIncluding":26},"EAECA338-DB26-4422-ACF9-2C459940900E",{"Vulnerable":4,"Criteria":68,"MatchCriteriaID":140,"VersionStartExcluding":26,"VersionStartIncluding":26,"VersionEndExcluding":26,"VersionEndIncluding":26},"8BDF6775-C4E7-4F60-9492-374DE04E6681",{"Vulnerable":4,"Criteria":71,"MatchCriteriaID":142,"VersionStartExcluding":26,"VersionStartIncluding":26,"VersionEndExcluding":26,"VersionEndIncluding":26},"303C8C86-E705-476F-B21B-AF6876EE0A56",[],[],{"lastModified":11,"cacheTime":146,"version":40},1792370620934,{"score":148,"band":149,"action":150,"scoredAt":151},47,"Medium","Plan remediation","2026-10-16T06:51:51.916454+00:00"]