CVE-2021-32623
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.
Does this matter?
Lower severity and a low EPSS score (1.25%). Track it; it rarely justifies an emergency change on its own.
Description
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.
- CVSS 3.1
- 6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 1.25% probability · 68th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-776
- Affected
- apereo/opencast
- Source
- security-advisories@github.com
References
- https://github.com/opencast/opencast/commit/8ae27da5a6f658011a5741b3210e715b0dc6213ePatch, Third Party Advisory
- https://github.com/opencast/opencast/security/advisories/GHSA-9gwx-9cwp-5c2mExploit, Third Party Advisory
- https://github.com/opencast/opencast/commit/8ae27da5a6f658011a5741b3210e715b0dc6213ePatch, Third Party Advisory
- https://github.com/opencast/opencast/security/advisories/GHSA-9gwx-9cwp-5c2mExploit, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.