CVE-2021-3827
Last modified
CVE-2021-3827 is a medium-severity vulnerability rated 6.8/10 on the CVSS scale. A flaw was found in keycloak, where the default ECP binding flow allows other authentication flows to be bypassed. By exploiting this behavior, an attacker can bypass the MFA authentication by sending a SOAP request with an AuthnRequest and Authorization header with the user's credentials. EPSS estimates a 0.87% chance of exploitation in the next 30 days.
Description
A flaw was found in keycloak, where the default ECP binding flow allows other authentication flows to be bypassed. By exploiting this behavior, an attacker can bypass the MFA authentication by sending a SOAP request with an AuthnRequest and Authorization header with the user's credentials. The highest threat from this vulnerability is to confidentiality and integrity.
Metrics
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Redhat | Keycloak | < 18.0.0 |
| Redhat | Single Sign-On | 7.0 |
| Redhat | Single Sign-On | 7.5.0 |
| Redhat | Openshift Container Platform | 4.8 |
| Redhat | Openshift Container Platform | 4.9 |
References
- https://access.redhat.com/security/cve/CVE-2021-3827Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2007512Issue Tracking, Vendor Advisory
- https://github.com/keycloak/keycloak/commit/44000caaf5051d7f218d1ad79573bd3d175cad0dPatch, Third Party Advisory
- https://github.com/keycloak/keycloak/security/advisories/GHSA-4pc7-vqv5-5r3vThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2021-3827Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2007512Issue Tracking, Vendor Advisory
- https://github.com/keycloak/keycloak/commit/44000caaf5051d7f218d1ad79573bd3d175cad0dPatch, Third Party Advisory
- https://github.com/keycloak/keycloak/security/advisories/GHSA-4pc7-vqv5-5r3vThird Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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