CVE-2023-28625: mod_auth_openidc is an authentication and authorization module for the Apache 2.x HTTP server that implements

This month

HIGH 7.5REMOTEWATCHLISTUPGRADE

CVE-2023-28625 is a high-severity flaw (CVSS 7.5) affecting mod auth openidc. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

mod_auth_openidc is an authentication and authorization module for the Apache 2.x HTTP server that implements the OpenID Connect Relying Party functionality. In versions 2.0.0 through 2.4.13.1, when `OIDCStripCookies` is set and a crafted cookie supplied, a NULL pointer dereference would occur, resulting in a segmentation fault. This could be used in a Denial-of-Service attack and thus presents an availability risk. Version 2.4.13.2 contains a pa

Why this priority

High severity
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.3% (top 29%)
CISA exploited list	No
Weakness	CWE-476
Published	2023-04-03
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: openidc

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-04-03 14:15 UTCPublished CVE record published
2026-06-17 05:48 UTCUpdated Record last modified

openidc mod auth openidc UPGRADE

Affected: >= 2.0.0 and < 2.4.13.2

Fixed in: 2.4.13.2

Safe to downgrade to: a release before 2.0.0

1. Check installed version

apt-cache policy mod-auth-openidc || rpm -q mod-auth-openidc || mod-auth-openidc --version

2. UPGRADE to 2.4.13.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mod-auth-openidc

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mod-auth-openidc

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2.0.0 (Debian / Ubuntu)

apt-cache madison mod-auth-openidc sudo apt install mod-auth-openidc=<VERSION_BEFORE_2.0.0> sudo apt-mark hold mod-auth-openidc

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list mod-auth-openidc sudo dnf downgrade mod-auth-openidc-<VERSION_BEFORE_2.0.0> sudo dnf versionlock add mod-auth-openidc

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-28625?

mod auth openidc: upgrade to 2.4.13.2. Exact commands for each OS are on this page.

Is CVE-2023-28625 being exploited?

CVE-2023-28625 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-28625 affect?

CVE-2023-28625 affects mod auth openidc. Severity is high (CVSS 7.5). mod_auth_openidc is an authentication and authorization module for the Apache 2.x HTTP server that implements the OpenID Connect Relying Party functionality. In versions 2.0.0 through 2.4.13.1, when `OIDCStripCookies` is set and a crafted c

How urgent is CVE-2023-28625?

Priority 54/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

Related CVEs

CVE-2024-24814 HIGH 7.5 UPGRADE MITIGATE mod_auth_openidc is an OpenID Certified™ authentication and authorization module for the Apache 2.x HTTP serve
CVE-2022-23527 MEDIUM 4.7 UPGRADE MITIGATE mod_auth_openidc is an OpenID Certified™ authentication and authorization module for the Apache 2.x HTTP serve
CVE-2021-39191 MEDIUM 4.7 UPGRADE MITIGATE mod_auth_openidc is an authentication/authorization module for the Apache 2.x HTTP server that functions as an
CVE-2021-32792 LOW 3.1 UPGRADE MITIGATE mod_auth_openidc is an authentication/authorization module for the Apache 2.x HTTP server that functions as an
CVE-2021-32791 MEDIUM 5.9 UPGRADE MITIGATE mod_auth_openidc is an authentication/authorization module for the Apache 2.x HTTP server that functions as an

References

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