CVE-2021-41767
Private tunnel identifier may be included in the non-private details of active connections
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 to access a particular connection to read from or interact with another user's active use of that same connection.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
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 to access a particular connection to read from or interact with another user's active use of that same connection.
- Record
CVE-2021-41767- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - CVSS 2.0
- 4.0 Medium
AV:N/AC:L/Au:S/C:P/I:N/A:N - Weakness
- CWE-200
- Updated
- 2026-11-02
CVE List No score
Private tunnel identifier may be included in the non-private details of active connections
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 to access a particular connection to read from or interact with another user's active use of that same connection.
- Record
CVE-2021-41767- Weakness
- CWE-200
- Updated
- 2026-11-02
EUVDEUVD-2021-28775 No score
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 to access a particular connection to read from or interact with another user's active use of that same connection.
- Record
EUVD-2021-28775- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-8jvg-8759-x9j6
Exposure of Sensitive Information to an Unauthorized Actor in Apache Guacamole
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 to access a particular connection to read from or interact with another user's active use of that same connection.
- Record
GHSA-8jvg-8759-x9j6- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-200
- Updated
- 2026-11-02
OSV
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 to access a particular connection to read from or interact with another user's active use of that same connection.
- Record
CVE-2021-41767- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - Updated
- 2026-11-02
OSVUBUNTU-CVE-2021-41767
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 to access a particular connection to read from or interact with another user's active use of that same connection.
- Record
UBUNTU-CVE-2021-41767- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - Updated
- 2026-11-02
OSVBIT-guacamole-2021-41767 No score
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 to access a particular connection to read from or interact with another user's active use of that same connection.
- Record
BIT-guacamole-2021-41767- Updated
- 2026-11-02
OSVBIT-guacamole-server-2021-41767 No score
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 to access a particular connection to read from or interact with another user's active use of that same connection.
- Record
BIT-guacamole-server-2021-41767- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
guacamoleBitnami |
before 1.3.0 | 1.3.0 |
guacamole-serverBitnami |
before 1.3.0 | 1.3.0 |
guacamole-serverUbuntu:16.04:LTS |
All versions, plus listed versions 0.8.3-1build20.8.3-2 |
None known |
guacamole-serverUbuntu:18.04:LTS |
All versions, plus listed versions 0.9.9-20.9.9-2build1 |
None known |
guacamole-serverUbuntu:22.04:LTS |
All versions, plus listed versions 1.3.0-11.3.0-1build11.3.0-1.1 |
None known |
guacamole-serverUbuntu:24.04:LTS |
All versions, plus listed versions 1.3.0-1.11.3.0-1.3ubuntu1 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-41767 is a medium vulnerability (CVSS 6.5) in Apache Guacamole, published January 11, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.00%, the 80th percentile. Fixed in guacamole 1.3.0.