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CVE-2021-3639

Date: August 22, 2022

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.

Severity Score

Related Resources (8)

https://github.com/latchset/mod_auth_mellon/commit/42a11261b9dad2e48d70bdff7c53dd57a12db6f5
https://access.redhat.com/security/cve/CVE-2021-3639
https://access.redhat.com/errata/RHSA-2022:1934
https://nvd.nist.gov/vuln/detail/CVE-2021-3639
https://security-tracker.debian.org/tracker/CVE-2021-3639
https://bugzilla.redhat.com/show_bug.cgi?id=1980648
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-3639
https://www.mend.io/vulnerability-database/CVE-2021-3639

Severity Score

Weakness Type (CWE)

URL Redirection to Untrusted Site ('Open Redirect')

CWE-601

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): REQUIRED
Scope (S): CHANGED
Confidentiality (C): LOW
Integrity (I): LOW
Availability (A): NONE

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