Apache Guacamole vulnerabilities

13 CVEs affecting Apache Guacamole, 0 known to be exploited (CISA KEV), with EPSS scores. Latest: CVE-2024-35164, published 2025-07-02.

Highest priority

Known exploited (CISA KEV) first, then by EPSS exploit probability.

CVE-2019-19603, published 2019-12-09. High severity, CVSS 7.5. EPSS: 11% chance of exploitation in the next 30 days. SQLite 3.30.1 mishandles certain SELECT statements with a nonexistent VIEW, leading to an application crash.
CVE-2016-1566, published 2017-02-02. Medium severity, CVSS 5.4. EPSS: 2.2% chance of exploitation in the next 30 days. Cross-site scripting (XSS) vulnerability in the file browser in Guacamole 0.9.8 and 0.9.9, when file transfer is enabled to a location shared by multiple users, allows remote authenticated users to…
CVE-2018-1340, published 2019-02-07. High severity, CVSS 7.5. EPSS: 2% chance of exploitation in the next 30 days. Prior to 1.0.0, Apache Guacamole used a cookie for client-side storage of the user's session token. This cookie lacked the "secure" flag, which could allow an attacker eavesdropping on the network to…
CVE-2021-41767, published 2022-01-11. Medium severity, CVSS 6.5. EPSS: 1.9% chance of exploitation in the next 30 days. Apache Guacamole 1.3.0 and older may incorrectly include a private tunnel identifier in the non-private details of some REST responses. This may allow an authenticated user who already has permission…
CVE-2021-43999, published 2022-01-11. High severity, CVSS 8.8. EPSS: 1.8% chance of exploitation in the next 30 days. Apache Guacamole 1.2.0 and 1.3.0 do not properly validate responses received from a SAML identity provider. If SAML support is enabled, this may allow a malicious user to assume the identity of…
CVE-2020-11997, published 2021-01-19. Medium severity, CVSS 4.3. EPSS: 1.3% chance of exploitation in the next 30 days. Apache Guacamole 1.2.0 and earlier do not consistently restrict access to connection history based on user visibility. If multiple users share access to the same connection, those users may be able…
CVE-2017-3158, published 2018-01-18. 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…
CVE-2023-30576, published 2023-06-07. High severity, CVSS 8.1. EPSS: 1.1% chance of exploitation in the next 30 days. 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…
CVE-2023-30575, published 2023-06-07. High severity, CVSS 7.5. EPSS: 1% chance of exploitation in the next 30 days. 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…
CVE-2023-43826, published 2023-12-19. High severity, CVSS 8.8. EPSS: 0.9% chance of exploitation in the next 30 days. 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,…

Latest

CVE-2024-35164, published 2025-07-02. High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days. 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…
CVE-2020-9498, published 2020-07-02. 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…
CVE-2020-9497, published 2020-07-02. 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…