{"answers":{"affected":"","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-4463 exists.","fix":"No fix has been published for CVE-2021-4463 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-4463 is a high-severity path traversal vulnerability in Shenzhen Longjing Technology Co. Ltd. BEMS API, published on 12 Nov 2025. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-4463 and fix it if it is affected.\n\nWhat it is: CVE-2021-4463 is a high-severity path traversal vulnerability in Shenzhen Longjing Technology Co. Ltd. BEMS API, published on 12 Nov 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-4463 exists.\n\nAffected product: Shenzhen Longjing Technology Co. Ltd. BEMS API. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2021-4463/ (Markdown: https://insights.sbomify.com/CVE-2021-4463/index.md)","id":"CVE-2021-4463","markdown":"https://insights.sbomify.com/CVE-2021-4463/index.md","name":"CVE-2021-4463","record":{"aliases":["GHSA-4m64-g8r6-3ghw"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"BEMS API","requires_auth":"none","summary":"Unauthenticated attackers can exploit path traversal in the downloads endpoint to read sensitive files from the server.","user_interaction":"not_required","vuln_class":"path_traversal"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":8.7,"severity":"high","source":"cna","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","version":"4.0"},"cwes":[{"id":"CWE-552","name":"Files or Directories Accessible to External Parties"},{"id":"CWE-22","name":"Improper Limitation of a Pathname to a Restricted Directory"}],"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.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":1,"refs":[{"date":null,"kind":"nuclei","ref":"http/cves/2021/CVE-2021-4463.yaml","stars":null,"title":"Longjing Technology BEMS API 1.21 - Unauthenticated Arbitrary File Download"}],"tier":"weaponised"},"has_fix":null,"headline":"Longjing Technology BEMS API \u003c= 1.21 Remote Arbitrary File Download","id":"CVE-2021-4463","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"path_traversal","year":"2021"},"n_packages":0,"n_references":7,"next":{"headline":"FIberHome AN5506-04-FA / HG6245D Routers Remote Stack Overflow","id":"CVE-2021-4464"},"packages":[],"prev":{"headline":"Employee Records System v1.0 Arbitrary File Upload RCE","id":"CVE-2021-4462"},"products":["BEMS API"],"published":"2025-11-12","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"},{"class":"attribution","licence":"MIT","name":"Nuclei templates"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-05-14","vendors":["Shenzhen Longjing Technology Co. Ltd."]},"summary":"Unauthenticated attackers can exploit path traversal in the downloads endpoint to read sensitive files from the server.","url":"https://insights.sbomify.com/CVE-2021-4463/"}