Vulnerability · Published Nov 12, 2025 · Assigned by VulnCheck
CVE-2021-4463Longjing Technology BEMS API <= 1.21 Remote Arbitrary File Download
High 8.7
In plain English
A high-severity path traversal in BEMS API from Shenzhen Longjing Technology Co. Ltd.. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.5% (higher than 75% of all known vulnerabilities). Ready-made attack tooling exists: Nuclei.
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Shenzhen Longjing Technology Co. Ltd. | BEMS API | 0 – through 1.21 |
Weakness: CWE-552, CWE-22 · 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
References
- https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5657.php technical-description, exploit
- https://www.exploit-db.com/exploits/50163 exploit
- https://packetstormsecurity.com/files/163702 exploit
- https://cxsecurity.com/issue/WLB-2021070173 exploit
- https://exchange.xforce.ibmcloud.com/vulnerabilities/206477 vdb-entry
- https://web.archive.org/web/20220527162453/http://www.ljkj2012.com/ product
- https://www.vulncheck.com/advisories/longjing-technology-bems-api-remote-arbitrary-file-download third-party-advisory