{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2021-4463", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2025-11-12T20:55:39.039Z", "datePublished": "2025-11-12T22:07:30.512Z", "dateUpdated": "2026-05-14T02:06:50.957Z" }, "containers": { "cna": { "affected": [ { "defaultStatus": "unaffected", "product": "BEMS API", "vendor": "Shenzhen Longjing Technology Co. Ltd.", "versions": [ { "lessThanOrEqual": "1.21", "status": "affected", "version": "0", "versionType": "custom" } ] } ], "credits": [ { "lang": "en", "type": "finder", "value": "Gjoko Krstic of Zero Science Lab" } ], "descriptions": [ { "lang": "en", "supportingMedia": [ { "base64": false, "type": "text/html", "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." } ], "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." } ], "impacts": [ { "capecId": "CAPEC-126", "descriptions": [ { "lang": "en", "value": "CAPEC-126 Path Traversal" } ] } ], "metrics": [ { "cvssV4_0": { "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "baseScore": 8.7, "baseSeverity": "HIGH", "exploitMaturity": "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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED" }, "format": "CVSS", "scenarios": [ { "lang": "en", "value": "GENERAL" } ] } ], "problemTypes": [ { "descriptions": [ { "cweId": "CWE-552", "description": "CWE-552 Files or Directories Accessible to External Parties", "lang": "en", "type": "CWE" } ] }, { "descriptions": [ { "cweId": "CWE-22", "description": "CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')", "lang": "en", "type": "CWE" } ] } ], "providerMetadata": { "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-05-14T02:06:50.957Z" }, "references": [ { "tags": [ "technical-description", "exploit" ], "url": "https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5657.php" }, { "tags": [ "exploit" ], "url": "https://www.exploit-db.com/exploits/50163" }, { "tags": [ "exploit" ], "url": "https://packetstormsecurity.com/files/163702" }, { "tags": [ "exploit" ], "url": "https://cxsecurity.com/issue/WLB-2021070173" }, { "tags": [ "vdb-entry" ], "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/206477" }, { "tags": [ "product" ], "url": "https://web.archive.org/web/20220527162453/http://www.ljkj2012.com/" }, { "tags": [ "third-party-advisory" ], "url": "https://www.vulncheck.com/advisories/longjing-technology-bems-api-remote-arbitrary-file-download" } ], "source": { "discovery": "UNKNOWN" }, "timeline": [ { "lang": "en", "time": "2021-07-27T16:00:00.000Z", "value": "ZSL-2021-5657 is publicly disclosed." } ], "title": "Longjing Technology BEMS API <= 1.21 Remote Arbitrary File Download", "x_generator": { "engine": "Vulnogram 0.5.0" }, "datePublic": "2021-07-29T00:00:00.000Z" }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2025-11-13T17:05:01.698452Z", "id": "CVE-2021-4463", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-11-13T17:05:15.434Z" } } ] } }