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CVE-2025-61601

BigBlueButton vulnerable to DoS via PollSubmitVote GraphQL mutation

Published: Oct 9, 2025Updated: Oct 20, 2025 Sources: CVE List NVDCWE-703
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.4%
Top 65.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-703

Affected Products

bigbluebuttonbigbluebutton
On-premWeb App
Communications / video-conferencing
bigbluebuttonoss-projectCommunicationsaka bbb

Exploitability

Official Patch Available

References

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

Timeline

Published
Oct 9, 2025
Last Updated
Oct 20, 2025

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