# CVE-2025-61602

## Summary

- **CVE ID:** CVE-2025-61602
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** CWE-703
- **Published:** Oct 9, 2025
- **Last Modified:** Mar 12, 2026

## 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 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.

## Affected Products

- bigbluebutton — bigbluebutton (< 3.0.13)

## References

- [CNA](https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-45j2-m26c-3pcm)
- [CNA](https://github.com/bigbluebutton/bigbluebutton/pull/23651)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.39%
- **EPSS Percentile:** 32.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._