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The vulnerability is due to improper token validation on a specific API endpoint. An attacker could exploit this vulnerability by sending a crafted request to the affected API. A successful exploit could allow the attacker to receive a token with administrator-level privileges that could be used to authenticate to the API on affected MSO and managed Cisco Application Policy Infrastructure Controller (APIC) devices.","A vulnerability in an API endpoint of Cisco ACI Multi-Site Orchestrator (MSO) installed on the Application Services Engine could allow an unauthenticated, re...","2021-02-24T20:15:13.66","2023-11-07T03:28:10.207",10,"CVSS:3.1\u002FAV:N\u002FAC:L\u002FPR:N\u002FUI:N\u002FS:C\u002FC:H\u002FI:H\u002FA:H",{"CVSSMetricV31":15,"CVSSMetricV30":27,"CVSSMetricV2":34,"CVSSMetricV40":27},[16,30],{"Source":17,"Type":18,"CVSSData":19,"ExploitabilityScore":28,"ImpactScore":29},"nvd@nist.gov","Primary",{"Version":20,"VectorString":13,"AttackVector":21,"AttackComplexity":22,"PrivilegesRequired":23,"UserInteraction":23,"Scope":24,"ConfidentialityImpact":25,"IntegrityImpact":25,"AvailabilityImpact":25,"BaseScore":12,"BaseSeverity":26,"ExploitCodeMaturity":27,"RemediationLevel":27,"ReportConfidence":27,"TemporalScore":27,"TemporalSeverity":27,"ConfidentialityRequirement":27,"IntegrityRequirement":27,"AvailabilityRequirement":25,"ModifiedAttackVector":27,"ModifiedAttackComplexity":27,"ModifiedPrivilegesRequired":27,"ModifiedUserInteraction":27,"ModifiedScope":27,"ModifiedConfidentialityImpact":27,"ModifiedIntegrityImpact":27,"ModifiedAvailabilityImpact":27,"EnvironmentalScore":27,"EnvironmentalSeverity":27},"3.1","NETWORK","LOW","NONE","CHANGED","HIGH","CRITICAL",null,3.9,6,{"Source":31,"Type":32,"CVSSData":33,"ExploitabilityScore":28,"ImpactScore":29},"d1c1063e-7a18-46af-9102-31f8928bc633","Secondary",{"Version":20,"VectorString":13,"AttackVector":21,"AttackComplexity":22,"PrivilegesRequired":23,"UserInteraction":23,"Scope":24,"ConfidentialityImpact":25,"IntegrityImpact":25,"AvailabilityImpact":25,"BaseScore":12,"BaseSeverity":26,"ExploitCodeMaturity":27,"RemediationLevel":27,"ReportConfidence":27,"TemporalScore":27,"TemporalSeverity":27,"ConfidentialityRequirement":27,"IntegrityRequirement":27,"AvailabilityRequirement":25,"ModifiedAttackVector":27,"ModifiedAttackComplexity":27,"ModifiedPrivilegesRequired":27,"ModifiedUserInteraction":27,"ModifiedScope":27,"ModifiedConfidentialityImpact":27,"ModifiedIntegrityImpact":27,"ModifiedAvailabilityImpact":27,"EnvironmentalScore":27,"EnvironmentalSeverity":27},[35],{"Source":17,"Type":18,"CVSSData":36,"BaseSeverity":25,"ExploitabilityScore":42,"ImpactScore":12,"ACInsufInfo":27,"ObtainAllPrivilege":27,"ObtainUserPrivilege":27,"ObtainOtherPrivilege":27,"UserInteractionRequired":27},{"Version":37,"VectorString":38,"AccessVector":21,"AccessComplexity":39,"Authentication":23,"ConfidentialityImpact":40,"IntegrityImpact":40,"AvailabilityImpact":40,"BaseScore":41,"BaseSeverity":27,"Exploitability":27,"RemediationLevel":27,"ReportConfidence":27,"TemporalScore":27,"CollateralDamagePotential":27,"TargetDistribution":27,"ConfidentialityRequirement":27,"IntegrityRequirement":27,"AvailabilityRequirement":27,"EnvironmentalScore":27},"2.0","AV:N\u002FAC:M\u002FAu:N\u002FC:C\u002FI:C\u002FA:C","MEDIUM","COMPLETE",9.3,8.6,0.14847,[43,43,43,43,43,43,43],"Critical",[47,52],{"vendor":48,"product":49,"version":50,"criteria":51,"vulnerable":4},"cisco","aci_multi-site_orchestrator","*","cpe:2.3:a:cisco:aci_multi-site_orchestrator:*:*:*:*:*:*:*:*",{"vendor":48,"product":53,"version":54,"criteria":55,"vulnerable":4},"application_policy_infrastructure_controller","3.0\\(3i\\)","cpe:2.3:a:cisco:application_policy_infrastructure_controller:3.0\\(3i\\):*:*:*:*:*:*:*",2,[58],{"url":59,"source":60,"tags":61},"https:\u002F\u002Ftools.cisco.com\u002Fsecurity\u002Fcenter\u002Fcontent\u002FCiscoSecurityAdvisory\u002Fcisco-sa-mso-authbyp-bb5GmBQv","Cisco",[62],"Vendor Advisory",1,[65],{"id":66,"name":67,"description":68,"extendedDescription":69,"status":70,"abstraction":71,"structure":72},"CWE-269","Improper Privilege Management","The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.","","Draft","Class","Simple",false,[],{"title":76,"metaDescription":77,"keywords":78,"canonicalUrl":79,"structuredData":80},"What is CVE-2021-1388? Vulnerability Analysis | Security Advisory | Precursor Intelligence","Comprehensive analysis of CVE-2021-1388, a critical severity cyber security vulnerability from 2021. A vulnerability in an API endpoint of Cisco ACI Multi-Si...","CVE-2021-1388, CVE-2021-1388 vulnerability, CVE-2021-1388 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, cisco security, aci_multi-site_orchestrator vulnerability, application_policy_infrastructure_controller vulnerability","\u002Fwhat-is\u002Fcve-2021-1388",{"@context":81,"@type":82,"headline":76,"description":77,"datePublished":10,"dateModified":11,"author":83,"publisher":87,"about":91,"mainEntityOfPage":95,"articleSection":98,"keywords":99},"https:\u002F\u002Fschema.org","TechArticle",{"@type":84,"name":85,"url":86},"Organization","Precursor Intelligence","https:\u002F\u002Fprecursorintelligence.com",{"@type":84,"name":85,"url":86,"logo":88},{"@type":89,"url":90},"ImageObject","https:\u002F\u002Fprecursorintelligence.com\u002Fimg\u002Flogos\u002Feplogo.png",{"@type":92,"name":6,"description":93,"additionalType":94},"Thing","Cybersecurity Vulnerability","https:\u002F\u002Fschema.org\u002FSoftwareBug",{"@type":96,"@id":97},"WebPage","https:\u002F\u002Fprecursorintelligence.com\u002Fwhat-is\u002Fcve-2021-1388","Cybersecurity","CVE-2021-1388, CVE-2021-1388 vulnerability, CVE-2021-1388 security, critical severity vulnerability, cybersecurity, vulnerability analysis, security advisory, CVE database, threat intelligence, security research",[101],{"Operator":27,"Negate":27,"Nodes":102},[103],{"Operator":104,"Negate":27,"CPEMatch":105},"OR",[106,110],{"Vulnerable":4,"Criteria":51,"MatchCriteriaID":107,"VersionStartExcluding":27,"VersionStartIncluding":108,"VersionEndExcluding":109,"VersionEndIncluding":27},"F9FC308E-D642-497A-9A64-A07420420D5B","3.0","3.0\\(3m\\)",{"Vulnerable":4,"Criteria":55,"MatchCriteriaID":111,"VersionStartExcluding":27,"VersionStartIncluding":27,"VersionEndExcluding":27,"VersionEndIncluding":27},"46C3C663-2309-4217-85A0-46B5667D8498",[],[114],{"id":115,"eventType":116,"eventTime":117,"details":118,"label":119,"color":120},"6d0fac51-6ec5-45ef-9b24-318ac3574996","HIGH_EPSS_DELTA","2026-06-16T04:05:45.177761+00:00","Daily EPSS score increased by 0.124 on 2023-12-30","EPSS Score Increased","red",{"lastModified":11,"cacheTime":122,"version":37},1792368180480,{"score":124,"band":125,"action":126,"scoredAt":127},55,"Medium","Plan remediation","2026-10-16T06:50:34.996852+00:00"]