[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fJvaodjguB36uR9sfhPIeuje8ds9lpJTuWfWM7OHsru4":3,"g5a-risk:CVE-2023-27321":108},{"success":4,"data":5,"meta":105},true,{"cveId":6,"title":7,"description":8,"shortDescription":9,"publishedDate":10,"lastModified":11,"cvssScore":12,"cvssVector":13,"cvssMetrics":14,"epssScore":32,"epssPercentile":27,"epssTimeSeries":33,"severity":34,"affectedProducts":35,"affectedProductsCount":41,"references":42,"referencesCount":57,"weaknesses":58,"weaknessesCount":41,"isActivelyExploited":67,"cisaInfo":27,"otxData":27,"relatedBlogPosts":68,"seoMetadata":69,"configurations":94,"relatedVendorCves":103,"notableEvents":104},"CVE-2023-27321","What is CVE-2023-27321?","OPC Foundation UA .NET Standard ConditionRefresh Resource Exhaustion Denial-of-Service Vulnerability. This vulnerability allows remote attackers to create a denial-of-service condition on affected installations of OPC Foundation UA .NET Standard. Authentication is not required to exploit this vulnerability.\n\nThe specific flaw exists within the handling of OPC UA ConditionRefresh requests. By sending a large number of requests, an attacker can consume all available resources on the server. An attacker can leverage this vulnerability to create a denial-of-service condition on the system. Was ZDI-CAN-20505.","OPC Foundation UA .NET Standard ConditionRefresh Resource Exhaustion Denial-of-Service Vulnerability. This vulnerability allows remote attackers to create a ...","2024-05-07T23:15:15.76","2026-06-17T05:44:47.17",7.5,"CVSS:3.0\u002FAV:N\u002FAC:L\u002FPR:N\u002FUI:N\u002FS:U\u002FC:N\u002FI:N\u002FA:H",{"CVSSMetricV31":15,"CVSSMetricV30":16,"CVSSMetricV2":30,"CVSSMetricV40":31},[],[17],{"Source":18,"Type":19,"CVSSData":20,"ExploitabilityScore":28,"ImpactScore":29},"zdi-disclosures@trendmicro.com","Secondary",{"Version":21,"VectorString":13,"AttackVector":22,"AttackComplexity":23,"PrivilegesRequired":24,"UserInteraction":24,"Scope":25,"ConfidentialityImpact":24,"IntegrityImpact":24,"AvailabilityImpact":26,"BaseScore":12,"BaseSeverity":26,"ExploitCodeMaturity":27,"RemediationLevel":27,"ReportConfidence":27,"TemporalScore":27,"TemporalSeverity":27,"ConfidentialityRequirement":27,"IntegrityRequirement":27,"AvailabilityRequirement":27,"ModifiedAttackVector":27,"ModifiedAttackComplexity":27,"ModifiedPrivilegesRequired":27,"ModifiedUserInteraction":27,"ModifiedScope":27,"ModifiedConfidentialityImpact":27,"ModifiedIntegrityImpact":27,"ModifiedAvailabilityImpact":27,"EnvironmentalScore":27,"EnvironmentalSeverity":27},"3.0","NETWORK","LOW","NONE","UNCHANGED","HIGH",null,3.9,3.6,[],[],0.01047,[32,32,32,32,32,32,32],"High",[36],{"vendor":37,"product":38,"version":39,"criteria":40,"vulnerable":4},"opcfoundation","ua-.netstandard","*","cpe:2.3:a:opcfoundation:ua-.netstandard:*:*:*:*:*:*:*:*",1,[43,48,53,55],{"url":44,"source":45,"tags":46},"https:\u002F\u002Ffiles.opcfoundation.org\u002FSecurityBulletins\u002FOPC%20Foundation%20Security%20Bulletin%20CVE-2023-27321.pdf","Opcfoundation",[47],"Vendor Advisory",{"url":49,"source":50,"tags":51},"https:\u002F\u002Fwww.zerodayinitiative.com\u002Fadvisories\u002FZDI-23-548\u002F","Zerodayinitiative",[52],"Third Party Advisory",{"url":44,"source":45,"tags":54},[47],{"url":49,"source":50,"tags":56},[52],4,[59],{"id":60,"name":61,"description":62,"extendedDescription":63,"status":64,"abstraction":65,"structure":66},"CWE-400","Uncontrolled Resource Consumption","The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.","Limited resources include memory, file system storage, database connection pool entries, and CPU. If an attacker can trigger the allocation of these limited resources, but the number or size of the resources is not controlled, then the attacker could cause a denial of service that consumes all available resources. This would prevent valid users from accessing the product, and it could potentially have an impact on the surrounding environment. For example, a memory exhaustion attack against an application could slow down the application as well as its host operating system.\nThere are at least three distinct scenarios which can commonly lead to resource exhaustion:\nResource exhaustion problems are often result due to an incorrect implementation of the following situations:","Draft","Class","Simple",false,[],{"title":70,"metaDescription":71,"keywords":72,"canonicalUrl":73,"structuredData":74},"What is CVE-2023-27321? Vulnerability Analysis | Security Advisory | Precursor Intelligence","Comprehensive analysis of CVE-2023-27321, a high severity cyber security vulnerability from 2024. OPC Foundation UA .NET Standard ConditionRefresh Resource E...","CVE-2023-27321, CVE-2023-27321 vulnerability, CVE-2023-27321 security, high severity vulnerability, cybersecurity, vulnerability analysis, security advisory, CVE database, threat intelligence, security research, vulnerability assessment, cyber threats, 2024, CVSS score, exploit, patch, remediation, opcfoundation security, ua-.netstandard vulnerability","\u002Fwhat-is\u002Fcve-2023-27321",{"@context":75,"@type":76,"headline":70,"description":71,"datePublished":10,"dateModified":11,"author":77,"publisher":81,"about":85,"mainEntityOfPage":89,"articleSection":92,"keywords":93},"https:\u002F\u002Fschema.org","TechArticle",{"@type":78,"name":79,"url":80},"Organization","Precursor Intelligence","https:\u002F\u002Fprecursorintelligence.com",{"@type":78,"name":79,"url":80,"logo":82},{"@type":83,"url":84},"ImageObject","https:\u002F\u002Fprecursorintelligence.com\u002Fimg\u002Flogos\u002Feplogo.png",{"@type":86,"name":6,"description":87,"additionalType":88},"Thing","Cybersecurity Vulnerability","https:\u002F\u002Fschema.org\u002FSoftwareBug",{"@type":90,"@id":91},"WebPage","https:\u002F\u002Fprecursorintelligence.com\u002Fwhat-is\u002Fcve-2023-27321","Cybersecurity","CVE-2023-27321, CVE-2023-27321 vulnerability, CVE-2023-27321 security, high severity vulnerability, cybersecurity, vulnerability analysis, security advisory, CVE database, threat intelligence, security research",[95],{"Operator":27,"Negate":27,"Nodes":96},[97],{"Operator":98,"Negate":67,"CPEMatch":99},"OR",[100],{"Vulnerable":4,"Criteria":40,"MatchCriteriaID":101,"VersionStartExcluding":27,"VersionStartIncluding":27,"VersionEndExcluding":102,"VersionEndIncluding":27},"47AB904C-A35B-425D-8F35-1972014BD4B4","1.4.371.86",[],[],{"lastModified":11,"cacheTime":106,"version":107},1792369619907,"2.0",{"score":109,"band":110,"action":111,"scoredAt":112},47,"Medium","Plan remediation","2026-10-16T07:01:55.178315+00:00"]