What is CVE-2020-27611?

CVE-2020-27611 is a high-severity vulnerability in Bigbluebutton, classified under Use of a Broken or Risky Cryptographic Algorithm. CVSS score: 7.3/10. Published 2020-10-21.

How severe is CVE-2020-27611?

High severity. CVSS v3 base score is 7.3 out of 10.

Vulnerability in Bigbluebutton

CVE-2020-27611

BigBlueButton through 2.2.28 uses STUN/TURN resources from a third party, which may represent an unintended endpoint.

Vulnerability class: POODLE (CVE-2014-3566)

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

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.007 (49.7th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 49.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Bigbluebutton

Weakness classification (CWE)

CWE-327 — Use of a Broken or Risky Cryptographic Algorithm

References

docs.bigbluebutton.org/admin/privacy.html (Not Applicable)
github.com/bigbluebutton/bigbluebutton/commit/d0bc77c3dbd858295004f15d7a57ec35e… (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2020-27611?: CVE-2020-27611 is a high-severity vulnerability in Bigbluebutton, classified under Use of a Broken or Risky Cryptographic Algorithm. CVSS score: 7.3/10. Published 2020-10-21.
How severe is CVE-2020-27611?: High severity. CVSS v3 base score is 7.3 out of 10.