How severe is CVE-2025-61601?

CVE-2025-61601 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2025-61601 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-61601?

CVE-2025-61601 affects Bigbluebutton. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-61601?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-61601 have an EU (EUVD) identifier?

Yes. CVE-2025-61601 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-33564.

When was CVE-2025-61601 published?

CVE-2025-61601 was published on 2025-10-09 and last updated on 2026-06-17.

CVE-2025-61601

CVE-2025-61601 is a high-severity vulnerability in Bigbluebutton with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-703.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (35th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-33564
Weakness: CWE-703
Affected product: Bigbluebutton
Published: 2025-10-09
Last modified: 2026-06-17

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 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.

Frequently asked questions

What is 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.
How severe is CVE-2025-61601?: CVE-2025-61601 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2025-61601 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-61601?: CVE-2025-61601 affects Bigbluebutton. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-61601?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-61601 have an EU (EUVD) identifier?: Yes. CVE-2025-61601 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-33564.
When was CVE-2025-61601 published?: CVE-2025-61601 was published on 2025-10-09 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:bigbluebutton:bigbluebutton:*:*:*:*:*:*:*:*

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