CVE-2017-3158: Apache Guacamole

High severity, CVSS 8.1. EPSS: 1.2% chance of exploitation in the next 30 days.

A race condition in Guacamole's terminal emulator in versions 0.9.5 through 0.9.10-incubating could allow writes of blocks of printed data to overlap. Such overlapping writes could cause packet data to be misread as the packet length, resulting in the remaining data being written beyond the end of a statically-allocated buffer.

Affected products

• Apache Guacamole: up to and including 0.9.9; version 0.9.10-incubating only

Published 2018-01-18. Last modified 2026-06-17.