BaseFortify

Publication date: 2025-11-12

Last updated on: 2025-11-12

Assigner: VulnCheck

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.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2025-11-12

Last Modified

2025-11-12

Generated

2026-07-06

AI Q&A

2025-11-13

EPSS Evaluated

2026-07-05

NVD

CVE-2021-4463

Affected Vendors & Products

Vendor	Product	Version / Range
longjing_technology	bems_api	1.21

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-552	The product makes files or directories accessible to unauthorized actors, even though they should not be.
CWE-22	The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

Attack-Flow Graph

Executive Summary

This vulnerability exists in Longjing Technology BEMS API versions up to and including 1.21. It is an unauthenticated arbitrary file download vulnerability in the 'downloads' endpoint. The 'fileName' parameter is not properly sanitized, which allows attackers to use traversal sequences to access sensitive files outside the intended directory.

Impact Analysis

An attacker can exploit this vulnerability to download arbitrary files from the server without authentication. This can lead to exposure of sensitive information, potentially compromising system confidentiality and security.

Hi! I’m here to help you understand CVE-2021-4463. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70