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

Quick assessment

Affected
Shenzhen Longjing Technology Co. Ltd. BEMS API
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Longjing BEMS API是中国龙净（Longjing）公司的一个电池能量管理系统的接口。 Longjing BEMS API 1.21及之前版本存在安全漏洞，该漏洞源于downloads端点存在任意文件下载问题，可能导致访问敏感文件。

AI Predicted 7.5 Difficulty: Trivial EPSS 1.45% · P73

Public Exploits 1

Nuclei · 1 CVE-2021-4463.yaml [template]

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System

Affected Version Matrix 1

VendorProduct Version RangeStatus
Shenzhen Longjing Technology Co. Ltd. BEMS API ≤ 1.21 affected
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I. Basic Information for CVE-2021-4463

Vulnerability Information
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Vulnerability Title
Longjing Technology BEMS API <= 1.21 Remote Arbitrary File Download
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
对外部实体的文件或目录可访问
Source: CVE Program / CVE List V5
Vulnerability Title
Longjing BEMS API 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Longjing BEMS API是中国龙净（Longjing）公司的一个电池能量管理系统的接口。 Longjing BEMS API 1.21及之前版本存在安全漏洞，该漏洞源于downloads端点存在任意文件下载问题，可能导致访问敏感文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Shenzhen Longjing Technology Co. Ltd. BEMS API 0 ~ 1.21 -

II. Public POCs for CVE-2021-4463

# POC Description Source Link Shenlong Link
1 Longjing Technology BEMS API 1.21 is vulnerable to local file inclusion. Input passed through the fileName parameter through the downloads API endpoint is not properly verified before being used to download files. This can be exploited to disclose the contents of arbitrary and sensitive files through directory traversal attacks. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-4463.yaml POC Details
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III. Intelligence Information for CVE-2021-4463

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Vendor Advisories for CVE-2021-4463 (1)

Proof of Concept for CVE-2021-4463 (1)

IV. Related Vulnerabilities

Same weakness: CWE-552

V. Comments for CVE-2021-4463

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