CVE-2021-4463
HIGH EPSS 68.0%
Published Nov 12, 20257mo ago · Modified Jun 17, 20262w ago
8.7 CVSS 4.0
Published Nov 12, 2025 7mo ago
Last Modified Jun 17, 2026 2w ago
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 Details
Base Score
Exploitability
Impact
Vector string
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X
Threat Intelligence
EPSS Exploit Probability
68.0% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 2
CWE-22 Path Traversal Resource Mgmt
CWE-552
References 7
- cxsecurity.com https://cxsecurity.com/issue/WLB-2021070173
- exchange.xforce.ibmcloud.com https://exchange.xforce.ibmcloud.com/vulnerabilities/206477
- packetstormsecurity.com https://packetstormsecurity.com/files/163702
- web.archive.org https://web.archive.org/web/20220527162453/http://www.ljkj2012.com/
- exploit-db.com https://www.exploit-db.com/exploits/50163
- vulncheck.com https://www.vulncheck.com/advisories/longjing-technology-bems-api-remote-arbitrary-file-download
- zeroscience.mk https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5657.php
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.