[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fRe7FBFh18GV2oPJBivZHLWmveNwc353q4jY8Q9lzEMU":3,"g5a-risk:CVE-2021-1591":145},{"success":4,"data":5,"meta":143},true,{"cveId":6,"title":7,"description":8,"shortDescription":9,"publishedDate":10,"lastModified":11,"cvssScore":12,"cvssVector":13,"cvssMetrics":14,"epssScore":45,"epssPercentile":26,"epssTimeSeries":46,"severity":47,"affectedProducts":48,"affectedProductsCount":73,"references":74,"referencesCount":81,"weaknesses":82,"weaknessesCount":81,"isActivelyExploited":91,"cisaInfo":26,"otxData":26,"relatedBlogPosts":92,"seoMetadata":93,"configurations":118,"relatedVendorCves":141,"notableEvents":142},"CVE-2021-1591","What is CVE-2021-1591?","A vulnerability in the EtherChannel port subscription logic of Cisco Nexus 9500 Series Switches could allow an unauthenticated, remote attacker to bypass access control list (ACL) rules that are configured on an affected device. This vulnerability is due to oversubscription of resources that occurs when applying ACLs to port channel interfaces. An attacker could exploit this vulnerability by attempting to access network resources that are protected by the ACL. A successful exploit could allow the attacker to access network resources that would be protected by the ACL that was applied on the port channel interface.","A vulnerability in the EtherChannel port subscription logic of Cisco Nexus 9500 Series Switches could allow an unauthenticated, remote attacker to bypass 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Advisory",1,[83],{"id":84,"name":85,"description":86,"extendedDescription":87,"status":88,"abstraction":89,"structure":90},"CWE-284","Improper Access Control","The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.","Access control involves the use of several protection mechanisms such as:\nWhen any mechanism is not applied or otherwise fails, attackers can compromise the security of the product by gaining privileges, reading sensitive information, executing commands, evading detection, etc.\nThere are two distinct behaviors that can introduce access control weaknesses:","Incomplete","Pillar","Simple",false,[],{"title":94,"metaDescription":95,"keywords":96,"canonicalUrl":97,"structuredData":98},"What is CVE-2021-1591? Vulnerability Analysis | Security Advisory | Precursor Intelligence","Comprehensive analysis of CVE-2021-1591, a medium severity cyber security vulnerability from 2021. A vulnerability in the EtherChannel port subscription logi...","CVE-2021-1591, CVE-2021-1591 vulnerability, CVE-2021-1591 security, medium 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, nx-os vulnerability, nexus_9500_16-slot vulnerability, nexus_9500_4-slot vulnerability, nexus_9500_8-slot vulnerability, nexus_9504 vulnerability","\u002Fwhat-is\u002Fcve-2021-1591",{"@context":99,"@type":100,"headline":94,"description":95,"datePublished":10,"dateModified":11,"author":101,"publisher":105,"about":109,"mainEntityOfPage":113,"articleSection":116,"keywords":117},"https:\u002F\u002Fschema.org","TechArticle",{"@type":102,"name":103,"url":104},"Organization","Precursor Intelligence","https:\u002F\u002Fprecursorintelligence.com",{"@type":102,"name":103,"url":104,"logo":106},{"@type":107,"url":108},"ImageObject","https:\u002F\u002Fprecursorintelligence.com\u002Fimg\u002Flogos\u002Feplogo.png",{"@type":110,"name":6,"description":111,"additionalType":112},"Thing","Cybersecurity Vulnerability","https:\u002F\u002Fschema.org\u002FSoftwareBug",{"@type":114,"@id":115},"WebPage","https:\u002F\u002Fprecursorintelligence.com\u002Fwhat-is\u002Fcve-2021-1591","Cybersecurity","CVE-2021-1591, CVE-2021-1591 vulnerability, CVE-2021-1591 security, medium severity vulnerability, cybersecurity, vulnerability analysis, security advisory, CVE database, threat intelligence, security research",[119],{"Operator":120,"Negate":26,"Nodes":121},"AND",[122,127],{"Operator":123,"Negate":26,"CPEMatch":124},"OR",[125],{"Vulnerable":4,"Criteria":53,"MatchCriteriaID":126,"VersionStartExcluding":26,"VersionStartIncluding":26,"VersionEndExcluding":26,"VersionEndIncluding":26},"F97A62E0-8A96-43A3-8FB1-FDC1B8A08049",{"Operator":123,"Negate":26,"CPEMatch":128},[129,131,133,135,137,139],{"Vulnerable":26,"Criteria":57,"MatchCriteriaID":130,"VersionStartExcluding":26,"VersionStartIncluding":26,"VersionEndExcluding":26,"VersionEndIncluding":26},"73F59A4B-AE92-4533-8EDC-D1DD850309FF",{"Vulnerable":26,"Criteria":60,"MatchCriteriaID":132,"VersionStartExcluding":26,"VersionStartIncluding":26,"VersionEndExcluding":26,"VersionEndIncluding":26},"492A2C86-DD38-466B-9965-77629A73814F",{"Vulnerable":26,"Criteria":63,"MatchCriteriaID":134,"VersionStartExcluding":26,"VersionStartIncluding":26,"VersionEndExcluding":26,"VersionEndIncluding":26},"1FB7AA46-4018-4925-963E-719E1037F759",{"Vulnerable":26,"Criteria":66,"MatchCriteriaID":136,"VersionStartExcluding":26,"VersionStartIncluding":26,"VersionEndExcluding":26,"VersionEndIncluding":26},"768BE390-5ED5-48A7-9E80-C4DE8BA979B1",{"Vulnerable":26,"Criteria":69,"MatchCriteriaID":138,"VersionStartExcluding":26,"VersionStartIncluding":26,"VersionEndExcluding":26,"VersionEndIncluding":26},"DDC2F709-AFBE-48EA-A3A2-DA1134534FB6",{"Vulnerable":26,"Criteria":72,"MatchCriteriaID":140,"VersionStartExcluding":26,"VersionStartIncluding":26,"VersionEndExcluding":26,"VersionEndIncluding":26},"7E02DC82-0D26-436F-BA64-73C958932B0A",[],[],{"lastModified":11,"cacheTime":144,"version":39},1792378884487,{"score":146,"band":147,"action":148,"scoredAt":149},31,"Low","Monitor","2026-10-16T06:51:55.033373+00:00"]