{"affected":[{"affectedData":[{"defaultStatus":"unaffected","product":"BEMS API","vendor":"Shenzhen Longjing Technology Co. Ltd.","versions":[{"lessThanOrEqual":"1.21","status":"affected","version":"0","versionType":"custom"}]}],"source":"disclosure@vulncheck.com"}],"cveTags":[],"descriptions":[{"lang":"en","value":"Longjing Technology BEMS API versions up to and including 1.21 contains an unauthenticated arbitrary file download vulnerability in the 'downloads' endpoint. The 'fileName' parameter is not properly sanitized, allowing attackers to craft traversal sequences and access sensitive files outside the intended directory."}],"id":"CVE-2021-4463","lastModified":"2026-06-17T04:19:48.733","metrics":{"cvssMetricV40":[{"cvssData":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","availabilityRequirement":"NOT_DEFINED","baseScore":8.7,"baseSeverity":"HIGH","confidentialityRequirement":"NOT_DEFINED","exploitMaturity":"NOT_DEFINED","integrityRequirement":"NOT_DEFINED","modifiedAttackComplexity":"NOT_DEFINED","modifiedAttackRequirements":"NOT_DEFINED","modifiedAttackVector":"NOT_DEFINED","modifiedPrivilegesRequired":"NOT_DEFINED","modifiedSubAvailabilityImpact":"NOT_DEFINED","modifiedSubConfidentialityImpact":"NOT_DEFINED","modifiedSubIntegrityImpact":"NOT_DEFINED","modifiedUserInteraction":"NOT_DEFINED","modifiedVulnAvailabilityImpact":"NOT_DEFINED","modifiedVulnConfidentialityImpact":"NOT_DEFINED","modifiedVulnIntegrityImpact":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"NONE","vulnerabilityResponseEffort":"NOT_DEFINED"},"source":"disclosure@vulncheck.com","type":"Secondary"}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"id":"CVE-2021-4463","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","timestamp":"2025-11-13T17:05:01.698452Z","version":"2.0.3"}}]},"published":"2025-11-12T22:15:41.863","references":[{"source":"disclosure@vulncheck.com","url":"https://cxsecurity.com/issue/WLB-2021070173"},{"source":"disclosure@vulncheck.com","url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/206477"},{"source":"disclosure@vulncheck.com","url":"https://packetstormsecurity.com/files/163702"},{"source":"disclosure@vulncheck.com","url":"https://web.archive.org/web/20220527162453/http://www.ljkj2012.com/"},{"source":"disclosure@vulncheck.com","url":"https://www.exploit-db.com/exploits/50163"},{"source":"disclosure@vulncheck.com","url":"https://www.vulncheck.com/advisories/longjing-technology-bems-api-remote-arbitrary-file-download"},{"source":"disclosure@vulncheck.com","url":"https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5657.php"}],"sourceIdentifier":"disclosure@vulncheck.com","vulnStatus":"Deferred","weaknesses":[{"description":[{"lang":"en","value":"CWE-22"},{"lang":"en","value":"CWE-552"}],"source":"disclosure@vulncheck.com","type":"Secondary"}]}