CVE-2020-9497: Apache Guacamole

Medium severity, CVSS 4.4. EPSS: 0.8% chance of exploitation in the next 30 days.

Apache Guacamole 1.1.0 and older do not properly validate datareceived from RDP servers via static virtual channels. If a userconnects to a malicious or compromised RDP server, specially-craftedPDUs could result in disclosure of information within the memory ofthe guacd process handling the connection.

Affected products

• Apache Guacamole: up to and including 1.1.0
• Debian Debian Linux: version 9.0 only
• Fedoraproject Fedora: version 32 only; version 33 only

Published 2020-07-02. Last modified 2026-06-17.