CVE-2021-41767: Private tunnel identifier may be included in the non-private details of active connections

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-01-11 · updated 2026-06-17
Weakness: CWE-200

Description

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.

Affected products

Apache Software Foundation Apache Guacamole: through 1.3.0

References

http://www.openwall.com/lists/oss-security/2022/01/11/6
https://lists.apache.org/thread/5l31k4jmzdsfz0xt8osrbl878gb3b7ro
http://www.openwall.com/lists/oss-security/2022/01/11/6
https://lists.apache.org/thread/5l31k4jmzdsfz0xt8osrbl878gb3b7ro

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