CVE-2025-61601: bigbluebutton — Exploit & Fix

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.

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CVSS v3.1 Score

7.5

HIGH

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

Weakness Type (CWE)

CWE-703 CWE-703

Affected Products

Vendor	Product	Versions
bigbluebutton	bigbluebutton	< 3.0.13

References

Advisories & Patches

https://github.com/bigbluebutton/bigbluebutton/pull/23662 https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-73j3-v3fq-fqx5 https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-73j3-v3fq-fqx5

Exploits

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

Frequently Asked Questions

What is CVE-2025-61601? +

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. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2025-61601? +

CVE-2025-61601 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-61601? +

CVE-2025-61601 affects products from bigbluebutton, specifically: bigbluebutton. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-61601? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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