What is CVE-2021-41767?

CVE-2021-41767 is a medium-severity vulnerability in Apache Guacamole, classified under Information Disclosure. CVSS score: 6.5/10. Published 2022-01-11.

How severe is CVE-2021-41767?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Information disclosure in Apache Guacamole

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.

Vulnerability class: Information Disclosure

Published 2022-01-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.019 (79.2th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 79th percentile — 79.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.019 · newest: 0.019 · change: 0.000

Affected products

Apache Guacamole
Apache Software Foundation Guacamole — versions unspecified

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

lists.apache.org/thread/5l31k4jmzdsfz0xt8osrbl878gb3b7ro (Mailing List, Vendor Advisory)
www.openwall.com/lists/oss-security/2022/01/11/6 (mailing-list, Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2021-41767?: CVE-2021-41767 is a medium-severity vulnerability in Apache Guacamole, classified under Information Disclosure. CVSS score: 6.5/10. Published 2022-01-11.
How severe is CVE-2021-41767?: Medium severity. CVSS v3 base score is 6.5 out of 10.