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CVE-2021-43821
CRITICAL · CVSS 9.9
EPSS exploitation probability: 0%
Published 2021-12-14T20:15:07.617 · Last modified 2026-06-17T04:11:30.613

Summary

Opencast is an Open Source Lecture Capture & Video Management for Education. Opencast before version 9.10 or 10.6 allows references to local file URLs in ingested media packages, allowing attackers to include local files from Opencast's host machines and making them available via the web interface. Before Opencast 9.10 and 10.6, Opencast would open and include local files during ingests. Attackers could exploit this to include most local files the process has read access to, extracting secrets from the host machine. An attacker would need to have the privileges required to add new media to exploit this. But these are often widely given. The issue has been fixed in Opencast 10.6 and 11.0. You can mitigate this issue by narrowing down the read access Opencast has to files on the file system

Affected products

apereo — opencast

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References

This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.