CVE-2021-4463 HIGH

CVE-2021-4463: Longjing Technology BEMS API <= 1.21 Remote Arbitrary File Download

Vendor Shenzhen Longjing Technology Co. Ltd.
Product BEMS API
Weakness CWE-552 · Files accessible externally
Published November 12, 2025
Last update May 14, 2026
View on NVD All CVEs

CVSS base score

8.7/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality —
Integrity —

CVSS 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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

November 12, 2025 CVE published
May 14, 2026 Record updated