CVE-2021-4463

Longjing Technology BEMS API <= 1.21 Remote Arbitrary File Download

Published Nov 12, 2025 CVSS 4.0 · 8.7 High EPSS 1.5% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Shenzhen Longjing Technology
Shenzhen Longjing Technology bems Api
Vendors & Products Shenzhen Longjing Technology
Shenzhen Longjing Technology bems Api
Type Values Removed Values Added
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.
Title Longjing Technology BEMS API <= 1.21 Remote Arbitrary File Download
Weaknesses CWE-22
CWE-552
References
Metrics cvssV4_0

{'score': 8.7, '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
May 14, 2026, 2:06 AM
Reserved
Nov 12, 2025, 8:55 PM
Status
Deferred
Published
Nov 12, 2025, 10:15 PM
Modified
Jun 17, 2026, 4:19 AM