CVE-2020-9498: Apache Guacamole

Medium severity, CVSS 6.7. EPSS: 0.7% chance of exploitation in the next 30 days.

Apache Guacamole 1.1.0 and older may mishandle pointers involved inprocessing data received via RDP static virtual channels. If a userconnects to a malicious or compromised RDP server, a series ofspecially-crafted PDUs could result in memory corruption, possiblyallowing arbitrary code to be executed with the privileges of therunning guacd process.

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.