Vulnerability in Bigbluebutton
CVE-2025-61602
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 crash the chat functionality for all participants in a meeting by sending a malformed `reactionEmojiId` in the GraphQL mutation `chatSendMessageReaction`. Version 3.0.13 contains a patch. No known workarounds are available.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.004 (30.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 30.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000
Affected products
- Bigbluebutton — versions < 3.0.13
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-45j2-m26c-3pcm (Exploit, Vendor Advisory)
- github.com/bigbluebutton/bigbluebutton/pull/23651 (Patch, Issue Tracking)
Frequently asked questions
- What is CVE-2025-61602?
- CVE-2025-61602 is a high-severity vulnerability in Bigbluebutton, classified under CWE-703. CVSS score: 7.5/10. Published 2025-10-09.
- How severe is CVE-2025-61602?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2025-61602 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.