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Fencer Vulns
medium 6.1

CVE-2019-20479 json

A flaw was found in mod_auth_openidc before version 2.4.1.

published 2020-02-20 6 y ago modified 2026-06-17 4 mo ago also EUVD-2019-11023

cvss
6.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.9%
EPSS 1.9% chance of exploitation in 30 days, percentile 79%
public exploits
0
none known

Summary

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.

Patch / fix

  • openidc mod_auth_openidc 2.4.1
  • libapache2-mod-auth-openidc Debian 14, Debian 13, Debian 12 2.4.1-1

debian advisories DEBIAN-CVE-2019-20479

  • mod_auth_openidc RHEL 7 1.8.8-7.el7
  • cjose RHEL 8 0.6.1-2.module+el8+2454+f890a43a
  • mod_auth_openidc RHEL 8 2.3.7-4.module+el8.2.0+6919+ac02cfd2.3

red hat advisories RHSA-2020:3970RHSA-2020:3032

  • apache2-mod_auth_openidc SLE Module for Server Applications 15 SP7, SLE Module for Server Applications 15 SP6, openSUSE Leap 15.6 2.4.17.1-150600.16.14.1
  • apache2-mod_auth_openidc SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES 12 SP5 +1 more 2.4.0-3.11.1
  • apache2-mod_auth_openidc SLE Module for Server Applications 15 SP1 2.3.8-3.7.1

suse advisories SUSE-SU-2025:4532-1SUSE-SU-2020:0706-1SUSE-SU-2020:0705-1

  • apache2-mod_auth_openidc openSUSE Leap 15.1 2.3.8-lp151.2.6.1

opensuse advisories openSUSE-SU-2020:0376-1

  • cjose AlmaLinux 8 0.6.1-2.module_el8.6.0+2868+44838709

almalinux advisories ALSA-2020:3032

  • cjose Rocky Linux 8 0.6.1-2.module+el8.3.0+129+2feafa46

rocky linux advisories RLSA-2020:3032

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2019-20479 updated cvss 5.8

mod_auth_openidc: Open redirect issue exists in URLs with slash and backslash

  • Red Hat Enterprise Linux AppStream (v. 8) cjose 0.6.1-2.module+el8+2454+f890a43a, mod_auth_openidc 2.3.7-4.module+el8.2.0+6919+ac02cfd2.3
    fixed: vendor fix RHSA-2020:3032
  • Red Hat Enterprise Linux Server (v. 7) mod_auth_openidc 1.8.8-7.el7 Red Hat Enterprise Linux Workstation (v. 7) mod_auth_openidc 1.8.8-7.el7
    fixed: vendor fix RHSA-2020:3970

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.89% chance of exploitation in the next 30 days, higher than 79% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 2.0 5.8 AV:N/AC:M/Au:N/C:P/I:P/A:N

Classification

Weakness
  • CWE-601 URL Redirection to Untrusted Site

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.