CVE-2021-39191

mediumpriority · track · 25EPSS 0.017 · 78 %ileDEEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.74% (78th) EPSS

CVSS 5.8 · medium

Is it mine?

40 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · cert_bund · nvd

EPSS · scored 2026-10-27

mod_auth_openidc is an authentication/authorization module for the Apache 2.x HTTP server that functions as an OpenID Connect Relying Party, authenticating users against an OpenID Connect Provider. In versions prior to 2.4.9.4, the 3rd-party init SSO functionality of mod_auth_openidc was reported to be vulnerable to an open redirect attack by supplying a crafted URL in the `target_link_uri` parameter. A patch in version 2.4.9.4 made it so that the `OIDCRedirectURLsAllowed` setting must be applied to the `target_link_uri` parameter. There are no known workarounds aside from upgrading to a patched version.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

Fixedcjose-0:0.6.1-2.module+el8+2454+f890a43a.aarch64 (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:1823
Fixedcjose-0:0.6.1-2.module+el8+2454+f890a43a.ppc64le (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:1823
Fixedcjose-0:0.6.1-2.module+el8+2454+f890a43a.s390x (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:1823
Fixedcjose-0:0.6.1-2.module+el8+2454+f890a43a.src (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:1823
Fixedcjose-0:0.6.1-2.module+el8+2454+f890a43a.x86_64 (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:1823
Fixedcjose-debuginfo-0:0.6.1-2.module+el8+2454+f890a43a.aarch64 (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:1823
Fixedcjose-debuginfo-0:0.6.1-2.module+el8+2454+f890a43a.ppc64le (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:1823
Fixedcjose-debuginfo-0:0.6.1-2.module+el8+2454+f890a43a.s390x (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:1823
Fixedcjose-debuginfo-0:0.6.1-2.module+el8+2454+f890a43a.x86_64 (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:1823
Fixedcjose-debugsource-0:0.6.1-2.module+el8+2454+f890a43a.aarch64 (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:1823
Fixedcjose-debugsource-0:0.6.1-2.module+el8+2454+f890a43a.ppc64le (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:1823
Fixedcjose-debugsource-0:0.6.1-2.module+el8+2454+f890a43a.s390x (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:1823
Fixedcjose-debugsource-0:0.6.1-2.module+el8+2454+f890a43a.x86_64 (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:1823
Fixedcjose-devel-0:0.6.1-2.module+el8+2454+f890a43a.aarch64 (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:1823
Fixedcjose-devel-0:0.6.1-2.module+el8+2454+f890a43a.ppc64le (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:1823
Fixedcjose-devel-0:0.6.1-2.module+el8+2454+f890a43a.s390x (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:1823
Fixedcjose-devel-0:0.6.1-2.module+el8+2454+f890a43a.x86_64 (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:1823
Fixedmod_auth_openidc-0:2.3.7-11.module+el8.6.0+14082+b6f23e95.aarch64 (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:1823
Fixedmod_auth_openidc-0:2.3.7-11.module+el8.6.0+14082+b6f23e95.ppc64le (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:1823
Fixedmod_auth_openidc-0:2.3.7-11.module+el8.6.0+14082+b6f23e95.s390x (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:1823
Fixedmod_auth_openidc-0:2.3.7-11.module+el8.6.0+14082+b6f23e95.src (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:1823
Fixedmod_auth_openidc-0:2.3.7-11.module+el8.6.0+14082+b6f23e95.x86_64 (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:1823
Fixedmod_auth_openidc-debuginfo-0:2.3.7-11.module+el8.6.0+14082+b6f23e95.aarch64 (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:1823
Fixedmod_auth_openidc-debuginfo-0:2.3.7-11.module+el8.6.0+14082+b6f23e95.ppc64le (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:1823
Fixedmod_auth_openidc-debuginfo-0:2.3.7-11.module+el8.6.0+14082+b6f23e95.s390x (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:1823
Fixedmod_auth_openidc-debuginfo-0:2.3.7-11.module+el8.6.0+14082+b6f23e95.x86_64 (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:1823
Fixedmod_auth_openidc-debugsource-0:2.3.7-11.module+el8.6.0+14082+b6f23e95.aarch64 (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:1823
Fixedmod_auth_openidc-debugsource-0:2.3.7-11.module+el8.6.0+14082+b6f23e95.ppc64le (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:1823
Fixedmod_auth_openidc-debugsource-0:2.3.7-11.module+el8.6.0+14082+b6f23e95.s390x (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:1823
Fixedmod_auth_openidc-debugsource-0:2.3.7-11.module+el8.6.0+14082+b6f23e95.x86_64 (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2022:1823

cvss

Technical severity, 0–10. One row per scoring source.

6.1

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.05.8mediumAV:N/AC:M/Au:N/C:P/I:P/A:Nprimary · NVD / NIST USexploitability 8.6 · impact 4.9

v3.16.1mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:Nprimary · NVD / NIST USexploitability 2.8 · impact 2.7

v3.14.7mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:Nsecondary · ENISA EU

v3.14.7mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:Nsecondary · security-advisories@github.comexploitability 2.8 · impact 1.4

v3.15.6mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)

v3.16.1mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:Nsecondary · Red Hat Product Security US

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-601USprimaryCWE-601US

affected products (40)

Products and version ranges known to be affected.

Debian Linuxall versionscert_bundDEcpe:/o:debian:debian_linux:-
Fedora Linuxall versionscert_bundDEcpe:/o:fedoraproject:fedora:-
Oracle Linuxall versionscert_bundDEcpe:/o:oracle:linux:-
Red Hat Enterprise Linux 8all versionscert_bundDEcpe:/o:redhat:enterprise_linux:8
SUSE Linuxall versionscert_bundDEcpe:/o:suse:suse_linux:-
ZmartZone mod_auth_openidc≤ ≤2.4.9.3enisa_euvdEU
debian debian linux= 10.0nvdUScpe:2.3:o:debian:debian_linux:*:*:*:*:*:*:*:*
fedoraproject fedora= 35nvdUScpe:2.3:o:fedoraproject:fedora:*:*:*:*:*:*:*:*
fedoraproject fedora= 36nvdUScpe:2.3:o:fedoraproject:fedora:*:*:*:*:*:*:*:*
openidc mod auth openidc< 2.4.9.4nvdUScpe:2.3:a:openidc:mod_auth_openidc:*:*:*:*:*:*:*:*
cjose-0:0.6.1-2.module+el8+2454+f890a43a.aarch64 (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)all versionsfixedredhat_csafUS
cjose-0:0.6.1-2.module+el8+2454+f890a43a.ppc64le (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)all versionsfixedredhat_csafUS
cjose-0:0.6.1-2.module+el8+2454+f890a43a.s390x (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)all versionsfixedredhat_csafUS
cjose-0:0.6.1-2.module+el8+2454+f890a43a.src (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)all versionsfixedredhat_csafUS
cjose-0:0.6.1-2.module+el8+2454+f890a43a.x86_64 (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)all versionsfixedredhat_csafUS
cjose-debuginfo-0:0.6.1-2.module+el8+2454+f890a43a.aarch64 (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)all versionsfixedredhat_csafUS
cjose-debuginfo-0:0.6.1-2.module+el8+2454+f890a43a.ppc64le (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)all versionsfixedredhat_csafUS
cjose-debuginfo-0:0.6.1-2.module+el8+2454+f890a43a.s390x (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)all versionsfixedredhat_csafUS
cjose-debuginfo-0:0.6.1-2.module+el8+2454+f890a43a.x86_64 (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)all versionsfixedredhat_csafUS
cjose-debugsource-0:0.6.1-2.module+el8+2454+f890a43a.aarch64 (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)all versionsfixedredhat_csafUS

showing 20 of 40

advisories (2)

Vendor and ecosystem advisories describing this.

RHSA-2022:1823Red Hat Security Advisory: mod_auth_openidc:2.3 security update2022-05-10csaf · redhat_csafUS
An update for the mod_auth_openidc:2.3 module is now available for Red Hat Enterprise Linux 8. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
WID-SEC-W-2023-0580Red Hat Enterprise Linux (mod_auth_openidc): Mehrere SchwachstellenDeutsch2022-05-10csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Red Hat Enterprise Linux ausnutzen, um falsche Informationen darzustellen, vertrauliche Informationen offenzulegen und einen Cross-Site-Scripting Angriff durchzuführen.

also known as (2)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund nvd redhat_csaf NVD CVE.org MITRE

published 2021-09-03modified 2026-06-17

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references (26)

External citations — patches, advisories, analysis.

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