What’s Vulnerable › Vulnerabilities

CVE-2025-61601: BigBlueButton vulnerable to DoS via PollSubmitVote GraphQL mutation

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-10-09 · updated 2026-10-19
• Weakness: CWE-703

Description

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: before 3.0.13 — fixed in 3.0.13

How to fix

Upgrade to a fixed version: bigbluebutton 3.0.13. Check the vendor advisory for mitigations.

References

• https://github.com/bigbluebutton/bigbluebutton/pull/23662
• https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-73j3-v3fq-fqx5
• https://www.youtube.com/watch?v=BwROSVIYjOY
• https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-73j3-v3fq-fqx5
• https://www.youtube.com/watch?v=BwROSVIYjOY

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