CVE-2021-41767

Name: CVE-2021-41767
Creator: NVD / NIST
Published: 2022-01-11T22:15:07.57+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.93%

Last modified Jun 17, 2026

CVE-2021-41767 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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.. EPSS estimates a 1.93% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

1.93%

77.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Apache	Guacamole	<= 1.3.0

References

http://www.openwall.com/lists/oss-security/2022/01/11/6Mailing List, Third Party Advisory
https://lists.apache.org/thread/5l31k4jmzdsfz0xt8osrbl878gb3b7roMailing List, Vendor Advisory
http://www.openwall.com/lists/oss-security/2022/01/11/6Mailing List, Third Party Advisory
https://lists.apache.org/thread/5l31k4jmzdsfz0xt8osrbl878gb3b7roMailing List, Vendor Advisory

Timeline

Published: Jan 11, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-41767?

How severe is CVE-2021-41767?

CVE-2021-41767 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.93% probability of exploitation in the next 30 days.

How do I fix CVE-2021-41767?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-41767?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST