Apache: >> Guacamole >> 1.5.0 Security Vulnerabilities
The terminal emulator of Apache Guacamole 1.5.5 and older does not properly validate console codes received from servers via text-based protocols like SSH. If a malicious user has access to a text-based connection, a specially-crafted sequence of console codes could allow arbitrary code to be executed
with the privileges of the running guacd process.
Users are recommended to upgrade to version 1.6.0, which fixes this issue.
CVSS Score
6.8
EPSS Score
0.0
Published
2025-07-02
Apache Guacamole 1.5.3 and older do not consistently ensure that values received from a VNC server will not result in integer overflow. If a user connects to a malicious or compromised VNC server, specially-crafted data could result in memory corruption, possibly allowing arbitrary code to be executed with the privileges of the running guacd process.
Users are recommended to upgrade to version 1.5.4, which fixes this issue.
CVSS Score
7.5
EPSS Score
0.001
Published
2023-12-19
Apache Guacamole 0.9.10 through 1.5.1 may continue to reference a freed RDP audio input buffer. Depending on timing, this may allow an attacker to execute arbitrary code with the privileges of the guacd process.
CVSS Score
6.8
EPSS Score
0.002
Published
2023-06-07
Apache Guacamole 1.5.1 and older may incorrectly calculate the lengths of instruction elements sent during the Guacamole protocol handshake, potentially allowing an attacker to inject Guacamole instructions during the handshake through specially-crafted data.
CVSS Score
6.5
EPSS Score
0.001
Published
2023-06-07