What is CVE-2020-27603?

CVE-2020-27603 is a high-severity vulnerability in Bigbluebutton. CVSS score: 7.5/10. Published 2020-10-21.

How severe is CVE-2020-27603?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2020-27603 known to be exploited?

6 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Bigbluebutton

CVE-2020-27603

BigBlueButton before 2.2.27 has an unsafe JODConverter setting in which LibreOffice document conversions can access external files.

Published 2020-10-21 · last modified 2026-06-17.

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:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.029 (86.6th percentile), scored 2026-10-04.

Low probability of exploitation in the next 30 days, but still tracked. 87th percentile — 86.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.029 · newest: 0.029 · change: 0.000

Affected products

Bigbluebutton

Public proof-of-concept exploits

References

www.golem.de/news/big-blue-button-das-grosse-blaue-sicherheitsrisiko-2010-15161… (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2020-27603?: CVE-2020-27603 is a high-severity vulnerability in Bigbluebutton. CVSS score: 7.5/10. Published 2020-10-21.
How severe is CVE-2020-27603?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2020-27603 known to be exploited?: 6 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.