[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fOvzzp2u5OM__DKjKs_NFBNl6w2M3U-ow_9TJmdVISis":3,"g5a-risk:CVE-2021-27877":140},{"success":4,"data":5,"meta":138},true,{"cveId":6,"title":7,"description":8,"shortDescription":9,"publishedDate":10,"lastModified":11,"cvssScore":12,"cvssVector":13,"cvssMetrics":14,"epssScore":49,"epssPercentile":28,"epssTimeSeries":50,"severity":51,"affectedProducts":52,"affectedProductsCount":58,"references":59,"referencesCount":81,"weaknesses":82,"weaknessesCount":58,"isActivelyExploited":4,"cisaInfo":86,"otxData":28,"relatedBlogPosts":87,"seoMetadata":88,"configurations":113,"relatedVendorCves":122,"notableEvents":123},"CVE-2021-27877","What is CVE-2021-27877?","An issue was discovered in Veritas Backup Exec before 21.2. It supports multiple authentication schemes: SHA authentication is one of these. This authentication scheme is no longer used in current versions of the product, but hadn't yet been disabled. An attacker could remotely exploit this scheme to gain unauthorized access to an Agent and execute privileged commands.","An issue was discovered in Veritas Backup Exec before 21.2. It supports multiple authentication schemes: SHA authentication is one of these. This authenticat...","2021-03-01T22:15:14.46","2025-11-03T15:16:26.793",9.8,"CVSS:3.1\u002FAV:N\u002FAC:L\u002FPR:N\u002FUI:N\u002FS:U\u002FC:H\u002FI:H\u002FA:H",{"CVSSMetricV31":15,"CVSSMetricV30":37,"CVSSMetricV2":38,"CVSSMetricV40":28},[16,31],{"Source":17,"Type":18,"CVSSData":19,"ExploitabilityScore":29,"ImpactScore":30},"cve@mitre.org","Secondary",{"Version":20,"VectorString":21,"AttackVector":22,"AttackComplexity":23,"PrivilegesRequired":24,"UserInteraction":24,"Scope":25,"ConfidentialityImpact":26,"IntegrityImpact":23,"AvailabilityImpact":24,"BaseScore":27,"BaseSeverity":26,"ExploitCodeMaturity":28,"RemediationLevel":28,"ReportConfidence":28,"TemporalScore":28,"TemporalSeverity":28,"ConfidentialityRequirement":28,"IntegrityRequirement":28,"AvailabilityRequirement":28,"ModifiedAttackVector":28,"ModifiedAttackComplexity":28,"ModifiedPrivilegesRequired":28,"ModifiedUserInteraction":28,"ModifiedScope":28,"ModifiedConfidentialityImpact":28,"ModifiedIntegrityImpact":28,"ModifiedAvailabilityImpact":28,"EnvironmentalScore":28,"EnvironmentalSeverity":28},"3.1","CVSS:3.1\u002FAV:N\u002FAC:L\u002FPR:N\u002FUI:N\u002FS:U\u002FC:H\u002FI:L\u002FA:N","NETWORK","LOW","NONE","UNCHANGED","HIGH",8.2,null,3.9,4.2,{"Source":32,"Type":33,"CVSSData":34,"ExploitabilityScore":29,"ImpactScore":36},"nvd@nist.gov","Primary",{"Version":20,"VectorString":13,"AttackVector":22,"AttackComplexity":23,"PrivilegesRequired":24,"UserInteraction":24,"Scope":25,"ConfidentialityImpact":26,"IntegrityImpact":26,"AvailabilityImpact":26,"BaseScore":12,"BaseSeverity":35,"ExploitCodeMaturity":28,"RemediationLevel":28,"ReportConfidence":28,"TemporalScore":28,"TemporalSeverity":28,"ConfidentialityRequirement":28,"IntegrityRequirement":28,"AvailabilityRequirement":28,"ModifiedAttackVector":28,"ModifiedAttackComplexity":28,"ModifiedPrivilegesRequired":28,"ModifiedUserInteraction":28,"ModifiedScope":28,"ModifiedConfidentialityImpact":28,"ModifiedIntegrityImpact":28,"ModifiedAvailabilityImpact":28,"EnvironmentalScore":28,"EnvironmentalSeverity":28},"CRITICAL",5.9,[],[39],{"Source":32,"Type":33,"CVSSData":40,"BaseSeverity":26,"ExploitabilityScore":46,"ImpactScore":47,"ACInsufInfo":48,"ObtainAllPrivilege":48,"ObtainUserPrivilege":48,"ObtainOtherPrivilege":48,"UserInteractionRequired":48},{"Version":41,"VectorString":42,"AccessVector":22,"AccessComplexity":23,"Authentication":24,"ConfidentialityImpact":43,"IntegrityImpact":43,"AvailabilityImpact":43,"BaseScore":44,"BaseSeverity":45,"Exploitability":28,"RemediationLevel":28,"ReportConfidence":28,"TemporalScore":28,"CollateralDamagePotential":28,"TargetDistribution":28,"ConfidentialityRequirement":28,"IntegrityRequirement":28,"AvailabilityRequirement":28,"EnvironmentalScore":28},"2.0","AV:N\u002FAC:L\u002FAu:N\u002FC:P\u002FI:P\u002FA:P","PARTIAL",7.5,"",10,6.4,false,0.6491,[49,49,49,49,49,49,49],"Critical",[53],{"vendor":54,"product":55,"version":56,"criteria":57,"vulnerable":4},"veritas","backup_exec","*","cpe:2.3:a:veritas:backup_exec:*:*:*:*:*:*:*:*",1,[60,67,72,74,76],{"url":61,"source":62,"tags":63},"http:\u002F\u002Fpacketstormsecurity.com\u002Ffiles\u002F168506\u002FVeritas-Backup-Exec-Agent-Remote-Code-Execution.html","Packetstormsecurity",[64,65,66],"Exploit","Third Party Advisory","VDB Entry",{"url":68,"source":69,"tags":70},"https:\u002F\u002Fwww.veritas.com\u002Fcontent\u002Fsupport\u002Fen_US\u002Fsecurity\u002FVTS21-001#issue1","Veritas",[71],"Vendor Advisory",{"url":61,"source":62,"tags":73},[64,65,66],{"url":68,"source":69,"tags":75},[71],{"url":77,"source":78,"tags":79},"https:\u002F\u002Fwww.cisa.gov\u002Fknown-exploited-vulnerabilities-catalog?field_cve=CVE-2021-27877","CISA",[80],"US Government Resource",5,[83],{"id":84,"name":84,"description":85},"Unknown","NVD-CWE-noinfo",{"shortDescription":45,"requiredAction":45,"vulnerabilityName":45,"dateAdded":28},[],{"title":89,"metaDescription":90,"keywords":91,"canonicalUrl":92,"structuredData":93},"What is CVE-2021-27877? Vulnerability Analysis | Security Advisory | Precursor Intelligence","Comprehensive analysis of CVE-2021-27877, a critical severity cyber security vulnerability from 2021. High exploit probability (64.9%). An issue was discover...","CVE-2021-27877, CVE-2021-27877 vulnerability, CVE-2021-27877 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, veritas security, backup_exec vulnerability, high risk vulnerability, actively exploited, exploit available","\u002Fwhat-is\u002Fcve-2021-27877",{"@context":94,"@type":95,"headline":89,"description":90,"datePublished":10,"dateModified":11,"author":96,"publisher":100,"about":104,"mainEntityOfPage":108,"articleSection":111,"keywords":112},"https:\u002F\u002Fschema.org","TechArticle",{"@type":97,"name":98,"url":99},"Organization","Precursor Intelligence","https:\u002F\u002Fprecursorintelligence.com",{"@type":97,"name":98,"url":99,"logo":101},{"@type":102,"url":103},"ImageObject","https:\u002F\u002Fprecursorintelligence.com\u002Fimg\u002Flogos\u002Feplogo.png",{"@type":105,"name":6,"description":106,"additionalType":107},"Thing","Cybersecurity Vulnerability","https:\u002F\u002Fschema.org\u002FSoftwareBug",{"@type":109,"@id":110},"WebPage","https:\u002F\u002Fprecursorintelligence.com\u002Fwhat-is\u002Fcve-2021-27877","Cybersecurity","CVE-2021-27877, CVE-2021-27877 vulnerability, CVE-2021-27877 security, critical severity vulnerability, cybersecurity, vulnerability analysis, security advisory, CVE database, threat intelligence, security research",[114],{"Operator":28,"Negate":28,"Nodes":115},[116],{"Operator":117,"Negate":48,"CPEMatch":118},"OR",[119],{"Vulnerable":4,"Criteria":57,"MatchCriteriaID":120,"VersionStartExcluding":28,"VersionStartIncluding":28,"VersionEndExcluding":121,"VersionEndIncluding":28},"2E6F2EEE-7E5A-4EA1-87F2-97C26EAE8FCC","21.2",[],[124,131],{"id":125,"eventType":126,"eventTime":127,"details":128,"label":129,"color":130},"bd8fe3a0-6436-4d15-926c-09a03e301df9","HIGH_EPSS_DELTA","2025-10-24T04:20:10.818531+00:00","Daily EPSS score increased by 0.251 on 2023-12-30","EPSS Score Increased","red",{"id":132,"eventType":133,"eventTime":134,"details":135,"label":136,"color":137},"6635b79c-bb90-4fba-a882-c617c1db495e","LOW_EPSS_DELTA","2025-11-22T04:05:51.330675+00:00","Daily EPSS score decreased by 0.489 on 2023-12-30","EPSS Score Decreased","green",{"lastModified":11,"cacheTime":139,"version":41},1792348121325,{"score":141,"band":51,"action":142,"scoredAt":143},90,"Emergency patch","2026-10-16T06:50:35.051761+00:00"]