CVE-2021-4463
High
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.
SeverityHigh
CVSS8.7
Exploit probability—
ProductBEMS API
PublishedNov 12, 2025
First seenNov 12, 2025
Weakness typeCWE-552CWE-552CWE-22Path traversal
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Shenzhen Longjing Technology Co. Ltd. BEMS API | v ≤ 1.21 | — |
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