Is CVE-2020-12443 actively exploited?

No active exploitation of CVE-2020-12443 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2020-12443 be exploited remotely?

Yes. CVE-2020-12443 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2020-12443?

CVE-2020-12443 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2020-12443

CRITICAL

CVE-2020-12443

CWE-22Published: April 29, 2020· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

BigBlueButton before 2.2.6 allows remote attackers to read arbitrary files because the presfilename (lowercase) value can be a .pdf filename while the presFilename (mixed case) value has a ../ sequence. This can be leveraged for privilege escalation via a directory traversal to bigbluebutton.properties. NOTE: this issue exists because of an ineffective mitigation to CVE-2020-12112 in which there was an attempted fix within an NGINX configuration file, without considering that the relevant part of NGINX is case-insensitive.

NVD Source

Technical Analysis

CVE-2020-12443 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.