XML Entity Expansion in Opencast - CVE-2021-32623
Published: June 15, 2021 / Updated: April 23, 2026
Vulnerability identifier: #VU127012
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2021-32623
CWE-ID: CWE-776
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Apereo Foundation
Affected software:
Opencast
Opencast
Detailed vulnerability description
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to uncontrolled resource consumption in the XML parser when processing a crafted XML request. A remote user can send a specially crafted XML document to cause a denial of service.
Exploitation requires ingest privileges, and a single HTTP request can trigger the issue.
How to mitigate CVE-2021-32623
Install security update from vendor's website.