Vulnerability in Bigbluebutton
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.
EPSS: 0.004 (36.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Bigbluebutton — versions < 3.0.13
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (Exploit, x_refsource_MISC)
Frequently asked questions
- What is CVE-2025-61601?
- CVE-2025-61601 is a high-severity vulnerability in Bigbluebutton, classified under CWE-703. CVSS score: 7.5/10. Published 2025-10-09.
- How severe is CVE-2025-61601?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2025-61601 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.