CVE-2025-61601: Bigbluebutton

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Bigbluebutton Bigbluebutton: before 3.0.13 (fixed in 3.0.13)

Published 2025-10-09. Last modified 2026-06-17.