CVE-2021-4463

CVE-2021-4463 is a high-severity vulnerability with a CVSS 4.0 base score of 8.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.

Key facts

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.

Frequently asked questions

What is CVE-2021-4463?
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.
How severe is CVE-2021-4463?
CVE-2021-4463 has a CVSS 4.0 base score of 8.7, rated high severity.
Is CVE-2021-4463 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2021-4463?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2021-4463 have an EU (EUVD) identifier?
Yes. CVE-2021-4463 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2021-34715.
When was CVE-2021-4463 published?
CVE-2021-4463 was published on 2025-11-12 and last updated on 2026-06-17.

References

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