What’s Vulnerable › Vulnerabilities

CVE-2019-20479

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-02-20 · updated 2026-06-17
• Weakness: CWE-601

Description

A flaw was found in mod_auth_openidc before version 2.4.1. An open redirect issue exists in URLs with a slash and backslash at the beginning.

Affected products

• Debian Linux: 8.0, 9.0
• Fedoraproject Fedora: 31, 32
• OpenIDC mod_auth_openidc: before 2.4.1 — fixed in 2.4.1
• openSUSE Leap: 15.1

How to fix

Upgrade to a fixed version: OpenIDC mod_auth_openidc 2.4.1. Check the vendor advisory for mitigations.

References

• http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00036.html
• https://github.com/zmartzone/mod_auth_openidc/commit/02431c0adfa30f478cf2eb20ed6ea51fdf446be7
• https://github.com/zmartzone/mod_auth_openidc/pull/453
• https://lists.debian.org/debian-lts-announce/2020/02/msg00035.html
• https://lists.debian.org/debian-lts-announce/2020/07/msg00028.html
• https://lists.debian.org/debian-lts-announce/2023/04/msg00034.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/27XJYAEONKJDESNE7WVZF5D2Z2OBY5JK/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NGXONXPWTX7DV62TIUIUVOZF4KQ6SIJE/
• http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00036.html
• https://github.com/zmartzone/mod_auth_openidc/commit/02431c0adfa30f478cf2eb20ed6ea51fdf446be7
• https://github.com/zmartzone/mod_auth_openidc/pull/453
• https://lists.debian.org/debian-lts-announce/2020/02/msg00035.html

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