CVE-2020-27604

Name: CVE-2020-27604
Creator: NVD / NIST
Published: 2020-10-21T15:15:26.967+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.13%

Last modified Jun 17, 2026

CVE-2020-27604 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. BigBlueButton before 2.3 does not implement LibreOffice sandboxing. This might make it easier for remote authenticated users to read the API shared secret in the bigbluebutton.properties file. EPSS estimates a 1.13% chance of exploitation in the next 30 days.

Description

BigBlueButton before 2.3 does not implement LibreOffice sandboxing. This might make it easier for remote authenticated users to read the API shared secret in the bigbluebutton.properties file. With the API shared secret, an attacker can (for example) use api/join to join an arbitrary meeting regardless of its guestPolicy setting.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

1.13%

62.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-116

Affected Software

Vendor	Product	Versions
Bigbluebutton	Bigbluebutton	< 2.2.8

References

https://docs.bigbluebutton.org/dev/api.htmlProduct
https://www.golem.de/news/big-blue-button-das-grosse-blaue-sicherheitsrisiko-2010-151610.htmlExploit, Third Party Advisory
https://docs.bigbluebutton.org/dev/api.htmlProduct
https://www.golem.de/news/big-blue-button-das-grosse-blaue-sicherheitsrisiko-2010-151610.htmlExploit, Third Party Advisory

Timeline

Published: Oct 21, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-27604?

How severe is CVE-2020-27604?

CVE-2020-27604 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.13% probability of exploitation in the next 30 days.

How do I fix CVE-2020-27604?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-27604?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST