CVE-2021-20718 Denial of service in mod auth openidc
A remote attacker can cause a denial-of-service condition in the mod_auth_openidc Apache module via unspecified vectors.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-20718?
CVE-2021-20718 is a high-severity denial of service vulnerability in Fedoraproject Fedora, published on 20 May 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
mod_auth_openidc 2.4.0 to 2.4.7 allows a remote attacker to cause a denial-of-service (DoS) condition via unspecified vectors.
Weakness: CWE-400
Which versions are affected by CVE-2021-20718?
It affects 3 products.
Linux distribution packages (6)
apache2-mod_auth_openidc SUSE:Linux Enterprise Server 12 SP4-LTSS | All versions | 2.4.0-3.14.1 |
apache2-mod_auth_openidc SUSE:Linux Enterprise Server 12 SP5 | All versions | 2.4.0-3.14.1 |
apache2-mod_auth_openidc SUSE:Linux Enterprise Server for SAP Applications 12 SP4 | All versions | 2.4.0-3.14.1 |
apache2-mod_auth_openidc SUSE:Linux Enterprise Server for SAP Applications 12 SP5 | All versions | 2.4.0-3.14.1 |
apache2-mod_auth_openidc SUSE:OpenStack Cloud 9 | All versions | 2.4.0-3.14.1 |
apache2-mod_auth_openidc SUSE:OpenStack Cloud Crowbar 9 | All versions | 2.4.0-3.14.1 |
Products include Fedoraproject Fedora, Openidc Mod Auth Openidc, Oracle Essbase.
How do I fix CVE-2021-20718?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2021-20718 being exploited?
There is no known exploitation of CVE-2021-20718 in the wild and no public exploit code.
Other vulnerabilities in Fedoraproject Fedora
Sources
Also known as AZL-7288, DEBIAN-CVE-2021-20718, MGASA-2021-0280, SUSE-SU-2021:1900-1, UBUNTU-CVE-2021-20718.