How severe is CVE-2020-27612?

CVE-2020-27612 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2020-27612 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-27612?

CVE-2020-27612 affects Bigbluebutton. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-27612?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-27612 published?

CVE-2020-27612 was published on 2020-10-21 and last updated on 2026-06-17.

CVE-2020-27612

CVE-2020-27612 is a medium-severity vulnerability in Bigbluebutton with a CVSS 3.x base score of 4.3. 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-200.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
CVSS v2: 4.0
EPSS exploit prediction: 1% (48th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Bigbluebutton
Published: 2020-10-21
Last modified: 2026-06-17

Description

Greenlight in BigBlueButton through 2.2.28 places usernames in room URLs, which may represent an unintended information leak to users in a room, or an information leak to outsiders if any user publishes a screenshot of a browser window.

Frequently asked questions

What is CVE-2020-27612?: Greenlight in BigBlueButton through 2.2.28 places usernames in room URLs, which may represent an unintended information leak to users in a room, or an information leak to outsiders if any user publishes a screenshot of a browser window.
How severe is CVE-2020-27612?: CVE-2020-27612 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2020-27612 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-27612?: CVE-2020-27612 affects Bigbluebutton. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-27612?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-27612 published?: CVE-2020-27612 was published on 2020-10-21 and last updated on 2026-06-17.

References

https://docs.bigbluebutton.org/admin/privacy.html

Affected products (1)

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

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