How severe is CVE-2020-27613?

CVE-2020-27613 has a CVSS 3.x base score of 8.4, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-27613 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-27613?

CVE-2020-27613 affects Bigbluebutton. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-27613?

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.

When was CVE-2020-27613 published?

CVE-2020-27613 was published on 2020-10-21 and last updated on 2026-06-17.

CVE-2020-27613

CVE-2020-27613 is a high-severity vulnerability in Bigbluebutton with a CVSS 3.x base score of 8.4. 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-312.

Key facts

Severity: High (CVSS 3.x base score 8.4)
CVSS v2: 4.6
EPSS exploit prediction: 0% (18th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-312
Affected product: Bigbluebutton
Published: 2020-10-21
Last modified: 2026-06-17

Description

The installation procedure in BigBlueButton before 2.2.28 (or earlier) uses ClueCon as the FreeSWITCH password, which allows local users to achieve unintended FreeSWITCH access.

Frequently asked questions

What is CVE-2020-27613?: The installation procedure in BigBlueButton before 2.2.28 (or earlier) uses ClueCon as the FreeSWITCH password, which allows local users to achieve unintended FreeSWITCH access.
How severe is CVE-2020-27613?: CVE-2020-27613 has a CVSS 3.x base score of 8.4, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-27613 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-27613?: CVE-2020-27613 affects Bigbluebutton. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-27613?: 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.
When was CVE-2020-27613 published?: CVE-2020-27613 was published on 2020-10-21 and last updated on 2026-06-17.

References

https://www.golem.de/news/big-blue-button-das-grosse-blaue-sicherheitsrisiko-2010-151610.html

Affected products (1)

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

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