CVE-2025-61602: BigBlueButton is an open-source virtual classroom

Q: How do I fix CVE-2025-61602?

bigbluebutton: upgrade to 3.0.13. Exact commands for each OS are on this page.

Q: Is CVE-2025-61602 being exploited?

CVE-2025-61602 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-61602 affect?

CVE-2025-61602 affects bigbluebutton. Severity is high (CVSS 7.5). 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 `r

Q: How urgent is CVE-2025-61602?

Priority 45/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2025-61602 is a high-severity flaw (CVSS 7.5) affecting bigbluebutton. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 67%)
CISA exploited list	No
Weakness	CWE-703
Published	2025-10-09
Last modified	2026-10-19

Publisher (CNA): GitHub, Inc. · Vendor: bigbluebutton

Last updated 2026-10-19 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-10-09 21:15 UTCPublished CVE record published
2026-10-19 16:10 UTCUpdated Record last modified

bigbluebutton bigbluebutton UPGRADE

Affected: < 3.0.13

Fixed in: 3.0.13

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy bigbluebutton || rpm -q bigbluebutton || bigbluebutton --version

2. UPGRADE to 3.0.13 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade bigbluebutton

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade bigbluebutton

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-61602?

bigbluebutton: upgrade to 3.0.13. Exact commands for each OS are on this page.

Is CVE-2025-61602 being exploited?

CVE-2025-61602 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-61602 affect?

CVE-2025-61602 affects bigbluebutton. Severity is high (CVSS 7.5). 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 `r

How urgent is CVE-2025-61602?

Priority 45/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-61601 HIGH 7.5 UPGRADE BigBlueButton is an open-source virtual classroom
CVE-2025-55200 HIGH 7.1 UPGRADE BigBlueButton is an open-source virtual classroom
CVE-2026-27736 MEDIUM 6.1 UPGRADE BigBlueButton is an open-source virtual classroom
CVE-2026-27467 LOW 2.0 UPGRADE BigBlueButton is an open-source virtual classroom
CVE-2026-27466 HIGH 7.2 UPGRADE BigBlueButton is an open-source virtual classroom

References

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