What’s Vulnerable › Vulnerabilities

CVE-2021-20718

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-05-20 · updated 2026-06-17
• Weakness: CWE-400

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.

Affected products

• Fedoraproject Fedora: 33, 34
• OpenIDC mod_auth_openidc: from 2.4.0 through 2.4.7
• Oracle Corporation Oracle Essbase: before 21.3 — fixed in 21.3

How to fix

Upgrade to a fixed version: Oracle Corporation Oracle Essbase 21.3. Check the vendor advisory for mitigations.

References

• https://github.com/zmartzone/mod_auth_openidc
• https://jvn.jp/en/jp/JVN49704918/index.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5HJK366TLFEOIYWTHQSZO24MSDPBXHJU/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FV4KYMQWPS3I2QPW2C253MLIAFGBZPLK/
• https://www.oracle.com/security-alerts/cpujan2022.html
• https://www.zmartzone.eu/
• https://github.com/zmartzone/mod_auth_openidc
• https://jvn.jp/en/jp/JVN49704918/index.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5HJK366TLFEOIYWTHQSZO24MSDPBXHJU/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FV4KYMQWPS3I2QPW2C253MLIAFGBZPLK/
• https://www.oracle.com/security-alerts/cpujan2022.html
• https://www.zmartzone.eu/

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