CVE-2021-4463— Longjing Technology BEMS API <= 1.21 Remote Arbitrary File Download
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
对外部实体的文件或目录可访问
Source: NVD (National Vulnerability Database)
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 |
|---|
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- Zero Science Lab » Longjing Technology BEMS API 1.21 Remote Arbitrary File Downloadtechnical-descriptionexploit
- https://nvd.nist.gov/vuln/detail/CVE-2021-4463
IV. Related Vulnerabilities
Same weakness: CWE-552
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Unauthorized Arbitrary File Read via RMI in AdminServer Inte - CVE-2019-25709
CF Image Hosting Script 1.6.5 Unauthorized Database Access - CVE-2026-33698
Chamilo LMS affected by unauthenticated RCE in main/install - CVE-2021-47960
Synology SSL VPN Client 安全漏洞 - CVE-2026-35446
LORIS has a path traversal in FilesDownloadHandler
V. Comments for CVE-2021-4463
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