The remote Oracle Linux 8 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2022-1934 advisory.

    [0.14.0-12.1]
    - Resolves: rhbz#1986805 - CVE-2021-3639 mod_auth_mellon: Open Redirect                                vulnerability in logout URLs [rhel-8]

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2022:1524-1 advisory.

  - 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. (CVE-2021-3639)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The version of mod_auth_mellon installed on the remote host is prior to 0.14.0-9. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2023-2077 advisory.

    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. (CVE-2021-3639)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

According to the versions of the mod_auth_mellon package installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - 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. (CVE-2021-3639)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote MiracleLinux 8 host has packages installed that are affected by a vulnerability as referenced in the AXSA:2022-3531:01 advisory.

    * mod_auth_mellon: Open Redirect vulnerability in logout URLs (CVE-2021-3639)

Tenable has extracted the preceding description block directly from the MiracleLinux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Rocky Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RLSA-2022:1934 advisory.

  - 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. (CVE-2021-3639)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2022:1934 advisory.

    The mod_auth_mellon module for the Apache HTTP Server is an authentication service that implements the     SAML 2.0 federation protocol. The module grants access based on the attributes received in assertions     generated by an IdP server.

    Security Fix(es):

    * mod_auth_mellon: Open Redirect vulnerability in logout URLs (CVE-2021-3639)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

    Additional Changes:

    For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.6 Release Notes     linked from the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2021-3639)

Note that Nessus relies on the presence of the package as reported by the vendor.

The remote Ubuntu 18.04 LTS / 20.04 LTS host has a package installed that is affected by a vulnerability as referenced in the USN-5069-1 advisory.

    It was discovered that mod-auth-mellon incorrectly filtered certain URLs. A remote attacker could possibly     use this issue to perform an open redirect attack.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Published	Updated	Severity
161322	Oracle Linux 8 : mod_auth_mellon (ELSA-2022-1934)	Nessus	Oracle Linux Local Security Checks	5/18/2022	10/22/2024	medium
160522	SUSE SLES15 Security Update : apache2-mod_auth_mellon (SUSE-SU-2022:1524-1)	Nessus	SuSE Local Security Checks	5/5/2022	7/14/2023	medium
176918	Amazon Linux 2 : mod_auth_mellon (ALAS-2023-2077)	Nessus	Amazon Linux Local Security Checks	6/8/2023	12/11/2024	medium
153688	EulerOS 2.0 SP5 : mod_auth_mellon (EulerOS-SA-2021-2511)	Nessus	Huawei Local Security Checks	9/27/2021	3/21/2023	medium
154400	EulerOS 2.0 SP3 : mod_auth_mellon (EulerOS-SA-2021-2597)	Nessus	Huawei Local Security Checks	10/25/2021	3/21/2023	medium
294491	MiracleLinux 8 : mod_auth_mellon-0.14.0-12.el8.1 (AXSA:2022-3531:01)	Nessus	Miracle Linux Local Security Checks	1/20/2026	1/20/2026	medium
184553	Rocky Linux 8 : mod_auth_mellon (RLSA-2022:1934)	Nessus	Rocky Linux Local Security Checks	11/6/2023	11/6/2023	medium
161033	RHEL 8 : mod_auth_mellon (RHSA-2022:1934)	Nessus	Red Hat Local Security Checks	5/11/2022	11/7/2024	medium
259875	Linux Distros Unpatched Vulnerability : CVE-2021-3639	Nessus	Misc.	8/30/2025	8/30/2025	medium
153142	Ubuntu 18.04 LTS / 20.04 LTS : mod-auth-mellon vulnerability (USN-5069-1)	Nessus	Ubuntu Local Security Checks	9/8/2021	8/27/2024	medium

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