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Vulnerability record · CVE-2021-4463 · published 12 November 2025

CVE-2021-4463: Path traversal vulnerability

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.

8.7 CVSS 4.0 High EPSS 1.5% · top 27.7% CWE-22 · Path traversalCWE-552 · CWE-552 Deferred
8.7CVSS 4.0 base score
1.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
7References
17 Jun 2026Last modified by NVD

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: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:

References

LinkTags
https://cxsecurity.com/issue/WLB-2021070173
https://exchange.xforce.ibmcloud.com/vulnerabilities/206477
https://packetstormsecurity.com/files/163702
https://web.archive.org/web/20220527162453/http://www.ljkj2012.com/
https://www.exploit-db.com/exploits/50163
https://www.vulncheck.com/advisories/longjing-technology-bems-api-remote-arbitrary-file-download
https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5657.php

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Source: NIST National Vulnerability Database (record CVE-2021-4463), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.