What’s Vulnerable › Vulnerabilities

CVE-2020-25820

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 10.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-10-21 · updated 2026-06-17
• Weakness: CWE-918

Description

BigBlueButton before 2.2.7 allows remote authenticated users to read local files and conduct SSRF attacks via an uploaded Office document that has a crafted URL in an ODF xlink field.

Affected products

• bigbluebutton: before 2.2.27 — fixed in 2.2.27

How to fix

Upgrade to a fixed version: bigbluebutton 2.2.27. Check the vendor advisory for mitigations.

References

• http://packetstormsecurity.com/files/159667/BigBlueButton-2.2.25-File-Disclosure-Server-Side-Request-Forgery.html
• https://github.com/bigbluebutton/bigbluebutton/commit/71fe1eac1e5bd73a2cd44bd79c001086b250e435
• https://github.com/bigbluebutton/bigbluebutton/compare/v2.2.26...v2.2.27
• https://www.golem.de/news/big-blue-button-das-grosse-blaue-sicherheitsrisiko-2010-151610.html
• https://www.redteam-pentesting.de/advisories/rt-sa-2020-005
• http://packetstormsecurity.com/files/159667/BigBlueButton-2.2.25-File-Disclosure-Server-Side-Request-Forgery.html
• https://github.com/bigbluebutton/bigbluebutton/commit/71fe1eac1e5bd73a2cd44bd79c001086b250e435
• https://github.com/bigbluebutton/bigbluebutton/compare/v2.2.26...v2.2.27
• https://www.golem.de/news/big-blue-button-das-grosse-blaue-sicherheitsrisiko-2010-151610.html
• https://www.redteam-pentesting.de/advisories/rt-sa-2020-005

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