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.

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.

EPSS: 0.004 (29.3th 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)

CWE-703

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC, 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.