libapache2-mod-auth-mellon: A flaw was found in mod_auth_mellon where it does not sanitize logout URLsproperly
CVE-2021-3639 is fixed in 3 products on 1 platform, first by libapache2-mod-auth-mellon 0.13.1-1ubuntu0.3, released August 3, 2021. It is not reported as exploited. Patch Radar priority: Routine.
A flaw was found in mod_auth_mellon where it does not sanitize logout URLsproperly. This issue could be used by an attacker to facilitate phishingattacks by tricking users into visiting a trusted web application URL thatredirects to an external and potentially malicious server. The highestthreat from this liability is to confidentiality and integrity.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libapache2-mod-auth-mellon · Debian 12.15 (bookworm) | 0.18.0-1 | DEBIAN-CVE-2021-3639 | Aug 22, 2022 |
| libapache2-mod-auth-mellon · Debian 13.5 (trixie) | 0.18.0-1 | DEBIAN-CVE-2021-3639 | Aug 22, 2022 |
| libapache2-mod-auth-mellon · Debian 14 | 0.18.0-1 | DEBIAN-CVE-2021-3639 | Aug 22, 2022 |
| libapache2-mod-auth-mellon · Ubuntu 18.04.6 LTS (bionic) | 0.13.1-1ubuntu0.3 | libapache2-mod-auth-mellon 0.13.1-1ubuntu0.3 | Aug 3, 2021 |
| libapache2-mod-auth-mellon · Ubuntu 20.04 LTS (focal) | 0.16.0-1ubuntu0.1 | libapache2-mod-auth-mellon 0.16.0-1ubuntu0.1 | Aug 3, 2021 |
| libapache2-mod-auth-mellon · Ubuntu 22.04.1 LTS (jammy) | 0.17.0-1ubuntu1 | libapache2-mod-auth-mellon 0.17.0-1ubuntu1 | Aug 3, 2021 |
| libapache2-mod-auth-mellon · Ubuntu 24.10 (oracular) | 0.17.0-1ubuntu1 | libapache2-mod-auth-mellon 0.17.0-1ubuntu1 | Jan 16, 2026 |
| libapache2-mod-auth-mellon · Ubuntu 25.04 (plucky) | 0.17.0-1ubuntu1 | libapache2-mod-auth-mellon 0.17.0-1ubuntu1 | Jan 16, 2026 |
| mod_auth_mellon · RHEL 8 | 0:0.14.0-12.el8.1 | RHSA-2022:1934 | May 10, 2022 |
| mod_auth_mellon · almalinux 8 | 0.14.0-12.el8.1 | ALSA-2022:1934 | May 10, 2022 |
| mod_auth_mellon · ol 8 | 0:0.14.0-12.el8.1 | ELSA-2022-1934 | May 17, 2022 |
| mod_auth_mellon · rocky 8 | 0:0.14.0-12.el8.1 | RLSA-2022:1934 | May 10, 2022 |
| mod_auth_mellon-diagnostics · RHEL 8 | 0:0.14.0-12.el8.1 | RHSA-2022:1934 | May 10, 2022 |
| mod_auth_mellon-diagnostics · almalinux 8 | 0.14.0-12.el8.1 | ALSA-2022:1934 | May 10, 2022 |
| mod_auth_mellon-diagnostics · ol 8 | 0:0.14.0-12.el8.1 | ELSA-2022-1934 | May 17, 2022 |
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