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Fencer Vulns
medium 6.5

CVE-2020-25820 json

BigBlueButton before 2.2.7 allows remote authenticated users to read local files and conduct SSRF attacks via an uploaded Office document t…

published 2020-10-21 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-18456

cvss
6.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
10.5%
EPSS 10.5% chance of exploitation in 30 days, percentile 95%
public exploits
1
Exploit-DB

Summary

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.

Patch / fix

  • bigbluebutton bigbluebutton 2.2.27

Timeline

  1. Published
  2. First public exploit (EDB-49070)

Exploit prediction

10.48% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-49070 BigBlueButton 2.2.25 - Arbitrary File Disclosure and Server-Side Request Forgery webapps, 2020-11-18
  • golem.de https://www.golem.de/news/big-blue-button-das-grosse-blaue-sicherheitsrisiko-2010-151610.html referenced PoC, tagged "exploit" by a source, unverified
  • packetstormsecurity.com http://packetstormsecurity.com/files/159667/BigBlueButton-2.2.25-File-Disclosure-Server-Side-Request-Forgery.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 4.0 AV:N/AC:L/Au:S/C:P/I:N/A:N

Classification

Weakness
  • CWE-918 Server-Side Request Forgery

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.