CVE-2025-61601Public exploitNetwork attack vector

Authenticated service interruption via oversized poll answers

Published Oct 9, 2025 · Updated Oct 9, 2025

Denial of service in BigBlueButton before 3.0.13 allows remote authenticated users to interrupt meetings via oversized poll answers. The pollSubmitUserVote GraphQL mutation accepts an answerIds array without a size limit, causing the backend to process hundreds of thousands of entries. Any user who can join an active meeting and submit a Choices poll response can freeze that meeting and can crash or freeze the server, disrupting other meetings.

CVSS severity7.5
High
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in BigBlueButton before 3.0.13 allows remote authenticated users to interrupt meetings via oversized poll answers. The pollSubmitUserVote GraphQL mutation accepts an answerIds array without a size limit, causing the backend to process hundreds of thousands of entries. Any user who can join an active meeting and submit a Choices poll response can freeze that meeting and can crash or freeze the server, disrupting other meetings.

The record

CVE
CVE-2025-61601
Published
Oct 9, 2025
Updated
Oct 9, 2025
Vendor
BigBlueButton Inc.
Product
BigBlueButton
Classifications
CWE-703, T1499.003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 9, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 9, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.0.13

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

BigBlueButton Inc. · BigBlueButtonversion=< 3.0.13

Published CVSS scores

7.5GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-703Improper Check or Handling of Exceptional Conditions
T1499.003Endpoint Denial of Service: Application Exhaustion Flood

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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