← Vulnerability feed

Vulnerability record · CVE-2025-61601 · published 9 October 2025

CVE-2025-61601: Bigbluebutton vulnerability

Bigbluebutton · Bigbluebutton

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.

7.5 CVSS 3.1 High EPSS 0.47% · top 61.7% CWE-703 · CWE-703
7.5CVSS 3.1 base score
0.47%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References, 4 tagged exploit
17 Jun 2026Last modified by NVD

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

Track CVE-2025-61601 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2020-27602Bigbluebutton injection vulnerabilityBigBlueButton before 2.2.7 does not have a protection mechanism for separator injection in meetingId, userId, and authToken.EPSS 1.4%9.8CVE-2020-27605Bigbluebutton vulnerabilityBigBlueButton through 2.2.28 uses Ghostscript for processing of uploaded EPS documents, and consequently may be subject to attacks related to a "schw…EPSS 1.2%9.8CVE-2020-12443Bigbluebutton path traversal vulnerabilityBigBlueButton before 2.2.6 allows remote attackers to read arbitrary files because the presfilename (lowercase) value can be a .pdf filename while th…EPSS 3.7%8.8CVE-2023-42803Bigbluebutton unrestricted file upload vulnerabilityBigBlueButton is an open-source virtual classroom. BigBlueButton prior to version 2.6.0-beta.2 is vulnerable to unrestricted file upload, where the i…EPSS 0.54%8.4CVE-2020-27613Bigbluebutton cleartext storage of sensitive data vulnerabilityThe installation procedure in BigBlueButton before 2.2.28 (or earlier) uses ClueCon as the FreeSWITCH password, which allows local users to achieve u…EPSS 0.27%8.2CVE-2026-27466Bigbluebutton exposure of resource to wrong sphere vulnerabilityBigBlueButton is an open-source virtual classroom. In versions 3.0.21 and below, the official documentation for "Server Customization" on Support for…EPSS 0.58%7.5CVE-2025-61602Bigbluebutton vulnerabilityBigBlueButton is an open-source virtual classroom. A denial-of-service (DoS) vulnerability in versions prior to 3.0.13 allows any authenticated user …EPSS 0.39%7.5CVE-2022-23488Bigbluebutton information exposure vulnerabilityBigBlueButton is an open source web conferencing system. Versions prior to 2.4-rc-6 are vulnerable to Insertion of Sensitive Information Into Sent Da…EPSS 0.60%

Source: NIST National Vulnerability Database (record CVE-2025-61601), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.