{"id":"CVE-2021-4463","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-4463","generatedAt":"2026-10-27T20:54:21.047Z","title":"Longjing Technology BEMS API versions up to and including 1.21 contains an unauthenticated arbitrary file download vulnerability in the 'downloads' endpoint.","description":"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.","published":"2025-11-12T22:15:42.000Z","lastModified":"2026-06-17T04:19:49.000Z","status":"Deferred","sourceIdentifier":"disclosure@vulncheck.com","cvss":{"version":"4.0","score":8.7,"severity":"HIGH","vector":"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/M"},"cwe":["CWE-22","CWE-552"],"affected":[],"epss":{"score":0.01543,"percentile":0.74783,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (1.54%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"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","source":"disclosure@vulncheck.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-4463","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}