BigBlueButton is an open-source virtual classroom. A Denial of Service (DoS) vulnerability in versions prior to 3.0.13 allows any authenticated user to freeze or crash the entire server by abusing the polling feature's `Choices` response type. By submitting a malicious payload with a massive array in the `answerIds` field, the attacker can cause the current meeting — and potentially all meetings on the server — to become unresponsive. Version 3.0.13 contains a patch. No known workarounds are available.
Fix
Patch, vendor advisory and mitigation references on NVD 3
- https://github.com/bigbluebutton/bigbluebutton/pull/23662 Issue Tracking, Patch
- https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-73j3-v3fq-fqx5 Exploit, Vendor Advisory
- https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-73j3-v3fq-fqx5 Exploit, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 7.5 · bigbluebuttonNVD modified 2026-10-19 16:10
Affected (CPE criteria) 1
cpe:2.3:a:bigbluebutton:bigbluebutton:*:*:*:*:*:*:*:*
References 5
- https://github.com/bigbluebutton/bigbluebutton/pull/23662 Issue Tracking, Patch
- https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-73j3-v3fq-fqx5 Exploit, Vendor Advisory
- https://www.youtube.com/watch?v=BwROSVIYjOY Exploit
- https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-73j3-v3fq-fqx5 Exploit, Vendor Advisory
- https://www.youtube.com/watch?v=BwROSVIYjOY Exploit