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CVE-2025-61601

Bigbluebutton vulnerability

7.5 HIGHPublic exploitEPSS 0.47%
  1. Published9 Oct 2025

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Bigbluebutton< 3.0.13

Remediation

Fixed in
Bigbluebutton≥ 3.0.13

References

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Frequently asked

Is CVE-2025-61601 being actively exploited?

CVE-2025-61601 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.47%.

How severe is CVE-2025-61601?

CVE-2025-61601 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.47% probability of exploitation.

Which products are affected by CVE-2025-61601?

Affected products include Bigbluebutton.

How do I fix CVE-2025-61601?

Upgrade affected software to a fixed version, for example Bigbluebutton 3.0.13 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-61601 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.