What’s Vulnerable › Vulnerabilities

CVE-2020-10758

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-09-16 · updated 2026-06-17
• Weakness: CWE-770

Description

A vulnerability was found in Keycloak before 11.0.1 where DoS attack is possible by sending twenty requests simultaneously to the specified keycloak server, all with a Content-Length header value that exceeds the actual byte count of the request body.

Affected products

• Keycloak: before 11.0.1 — fixed in 11.0.1
• RedHat Openshift Application Runtimes: 1.0
• Red Hat Single Sign-On: 7.0, 7.4

How to fix

Upgrade to a fixed version: Keycloak 11.0.1. Check the vendor advisory for mitigations.

References

• https://bugzilla.redhat.com/show_bug.cgi?id=1843849
• https://github.com/keycloak/keycloak/commit/bee4ca89897766c4b68856eafe14f1a3dad34251
• https://bugzilla.redhat.com/show_bug.cgi?id=1843849
• https://github.com/keycloak/keycloak/commit/bee4ca89897766c4b68856eafe14f1a3dad34251

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