CVE-2021-32623 HIGH

CVE-2021-32623: Opencast vulnerable to billion laughs attack (XML bomb)

Vendor Opencast
Product opencast
Weakness CWE-776
Published June 15, 2021
Last update August 3, 2024

CVSS base score

8.1/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality None
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

What the vulnerability does

01Description

Opencast is a free and open source solution for automated video capture and distribution. Versions of Opencast prior to 9.6 are vulnerable to the billion laughs attack, which allows an attacker to easily execute a (seemingly permanent) denial of service attack, essentially taking down Opencast using a single HTTP request. To exploit this, users need to have ingest privileges, limiting the group of potential attackers The problem has been fixed in Opencast 9.6. There is no known workaround for this issue.

Key dates

02Disclosure timeline

June 15, 2021 CVE published
August 3, 2024 Record updated