[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fbkh22nx3ItRGLUSBdzYk-p9eyAAA2v2aYDNjjWwVjxo":3,"g5a-risk:CVE-2021-36159":125},{"success":4,"data":5,"meta":123},true,{"cveId":6,"title":7,"description":8,"shortDescription":9,"publishedDate":10,"lastModified":11,"cvssScore":12,"cvssVector":13,"cvssMetrics":14,"epssScore":40,"epssPercentile":27,"epssTimeSeries":41,"severity":42,"affectedProducts":43,"affectedProductsCount":49,"references":50,"referencesCount":75,"weaknesses":76,"weaknessesCount":49,"isActivelyExploited":85,"cisaInfo":27,"otxData":27,"relatedBlogPosts":86,"seoMetadata":87,"configurations":112,"relatedVendorCves":121,"notableEvents":122},"CVE-2021-36159","What is CVE-2021-36159?","libfetch before 2021-07-26, as used in apk-tools, xbps, and other products, mishandles numeric strings for the FTP and HTTP protocols. The FTP passive mode implementation allows an out-of-bounds read because strtol is used to parse the relevant numbers into address bytes. It does not check if the line ends prematurely. If it does, the for-loop condition checks for the '\\0' terminator one byte too late.","libfetch before 2021-07-26, as used in apk-tools, xbps, and other products, mishandles numeric strings for the FTP and HTTP protocols. The FTP passive mode i...","2021-08-03T14:15:08.233","2023-11-07T03:36:43.337",9.1,"CVSS:3.1\u002FAV:N\u002FAC:L\u002FPR:N\u002FUI:N\u002FS:U\u002FC:H\u002FI:N\u002FA:H",{"CVSSMetricV31":15,"CVSSMetricV30":27,"CVSSMetricV2":30,"CVSSMetricV40":27},[16],{"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":23,"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","UNCHANGED","HIGH","CRITICAL",null,3.9,5.2,[31],{"Source":17,"Type":18,"CVSSData":32,"BaseSeverity":37,"ExploitabilityScore":38,"ImpactScore":39,"ACInsufInfo":27,"ObtainAllPrivilege":27,"ObtainUserPrivilege":27,"ObtainOtherPrivilege":27,"UserInteractionRequired":27},{"Version":33,"VectorString":34,"AccessVector":21,"AccessComplexity":22,"Authentication":23,"ConfidentialityImpact":35,"IntegrityImpact":23,"AvailabilityImpact":35,"BaseScore":36,"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:L\u002FAu:N\u002FC:P\u002FI:N\u002FA:P","PARTIAL",6.4,"MEDIUM",10,4.9,0.02637,[40,40,40,40,40,40,40],"Critical",[44],{"vendor":45,"product":46,"version":47,"criteria":48,"vulnerable":4},"freebsd","libfetch","*","cpe:2.3:a:freebsd:libfetch:*:*:*:*:*:*:*:*",1,[51,57,62,66,69,72],{"url":52,"source":53,"tags":54},"https:\u002F\u002Fgithub.com\u002Ffreebsd\u002Ffreebsd-src\u002Fcommits\u002Fmain\u002Flib\u002Flibfetch","GitHub",[55,56],"Patch","Third Party Advisory",{"url":58,"source":59,"tags":60},"https:\u002F\u002Fgitlab.alpinelinux.org\u002Falpine\u002Fapk-tools\u002F-\u002Fissues\u002F10749","Alpinelinux",[61,56],"Exploit",{"url":63,"source":64,"tags":65},"https:\u002F\u002Flists.apache.org\u002Fthread.html\u002Fr61db8e7dcb56dc000a5387a88f7a473bacec5ee01b9ff3f55308aacc%40%3Cdev.kafka.apache.org%3E","Apache",[],{"url":67,"source":64,"tags":68},"https:\u002F\u002Flists.apache.org\u002Fthread.html\u002Fr61db8e7dcb56dc000a5387a88f7a473bacec5ee01b9ff3f55308aacc%40%3Cusers.kafka.apache.org%3E",[],{"url":70,"source":64,"tags":71},"https:\u002F\u002Flists.apache.org\u002Fthread.html\u002Frbf4ce74b0d1fa9810dec50ba3ace0caeea677af7c27a97111c06ccb7%40%3Cdev.kafka.apache.org%3E",[],{"url":73,"source":64,"tags":74},"https:\u002F\u002Flists.apache.org\u002Fthread.html\u002Frbf4ce74b0d1fa9810dec50ba3ace0caeea677af7c27a97111c06ccb7%40%3Cusers.kafka.apache.org%3E",[],6,[77],{"id":78,"name":79,"description":80,"extendedDescription":81,"status":82,"abstraction":83,"structure":84},"CWE-125","Out-of-bounds Read","The product reads data past the end, or before the beginning, of the intended buffer.","","Draft","Base","Simple",false,[],{"title":88,"metaDescription":89,"keywords":90,"canonicalUrl":91,"structuredData":92},"What is CVE-2021-36159? Vulnerability Analysis | Security Advisory | Precursor Intelligence","Comprehensive analysis of CVE-2021-36159, a critical severity cyber security vulnerability from 2021. libfetch before 2021-07-26, as used in apk-tools, xbps,...","CVE-2021-36159, CVE-2021-36159 vulnerability, CVE-2021-36159 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, freebsd security, libfetch vulnerability","\u002Fwhat-is\u002Fcve-2021-36159",{"@context":93,"@type":94,"headline":88,"description":89,"datePublished":10,"dateModified":11,"author":95,"publisher":99,"about":103,"mainEntityOfPage":107,"articleSection":110,"keywords":111},"https:\u002F\u002Fschema.org","TechArticle",{"@type":96,"name":97,"url":98},"Organization","Precursor Intelligence","https:\u002F\u002Fprecursorintelligence.com",{"@type":96,"name":97,"url":98,"logo":100},{"@type":101,"url":102},"ImageObject","https:\u002F\u002Fprecursorintelligence.com\u002Fimg\u002Flogos\u002Feplogo.png",{"@type":104,"name":6,"description":105,"additionalType":106},"Thing","Cybersecurity Vulnerability","https:\u002F\u002Fschema.org\u002FSoftwareBug",{"@type":108,"@id":109},"WebPage","https:\u002F\u002Fprecursorintelligence.com\u002Fwhat-is\u002Fcve-2021-36159","Cybersecurity","CVE-2021-36159, CVE-2021-36159 vulnerability, CVE-2021-36159 security, critical severity vulnerability, cybersecurity, vulnerability analysis, security advisory, CVE database, threat intelligence, security research",[113],{"Operator":27,"Negate":27,"Nodes":114},[115],{"Operator":116,"Negate":27,"CPEMatch":117},"OR",[118],{"Vulnerable":4,"Criteria":48,"MatchCriteriaID":119,"VersionStartExcluding":27,"VersionStartIncluding":27,"VersionEndExcluding":120,"VersionEndIncluding":27},"181F9AFF-1B2E-4F70-B497-F7BCDF2499C2","2021-07-26",[],[],{"lastModified":11,"cacheTime":124,"version":33},1792347667918,{"score":126,"band":127,"action":128,"scoredAt":129},53,"Medium","Plan remediation","2026-10-16T06:51:41.201698+00:00"]