What is CVE-2021-3639?

CVE-2021-3639 is a medium-severity vulnerability in Uninett Mod Auth Mellon, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.1/10. Published 2022-08-22.

How severe is CVE-2021-3639?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Open Redirect in Uninett Mod Auth Mellon

CVE-2021-3639

A flaw was found in mod_auth_mellon where it does not sanitize logout URLs properly. This issue could be used by an attacker to facilitate phishing attacks by tricking users into visiting a trusted web application URL that redirects to an external and potentially malicious server. The highest threat from this liability is to confidentiality and integrity.

Vulnerability class: Open Redirect

EPSS: 0.008 (51.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Uninett Mod_auth_mellon
N/a Mod_auth_mellon — versions Fixed in v0.18.0

Weakness classification (CWE)

CWE-601 — URL Redirection to Untrusted Site (Open Redirect)

References

secalert@redhat.com (Third Party Advisory, x_refsource_MISC, Issue Tracking)
secalert@redhat.com (Patch, Third Party Advisory, x_refsource_MISC)
secalert@redhat.com (Patch, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-3639?: CVE-2021-3639 is a medium-severity vulnerability in Uninett Mod Auth Mellon, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.1/10. Published 2022-08-22.
How severe is CVE-2021-3639?: Medium severity. CVSS v3 base score is 6.1 out of 10.