CVE-2021-3827
MEDIUMKeycloak < 18.0.0 - Authentication Bypass via ECP Binding Flow
Title source: llmDescription
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.
References (4)
Core 4
Core References
Third Party Advisory x_refsource_misc
https://github.com/keycloak/keycloak/security/advisories/GHSA-4pc7-vqv5-5r3v
Patch, Third Party Advisory x_refsource_misc
https://github.com/keycloak/keycloak/commit/44000caaf5051d7f218d1ad79573bd3d175cad0d
Issue Tracking, Vendor Advisory x_refsource_misc
https://bugzilla.redhat.com/show_bug.cgi?id=2007512
Vendor Advisory x_refsource_misc
https://access.redhat.com/security/cve/CVE-2021-3827
Scores
CVSS v3
6.8
EPSS
0.0021
EPSS Percentile
43.1%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Details
CWE
CWE-287
Status
published
Products (6)
org.keycloak/keycloak-saml-core
0 - 18.0.0Maven
redhat/keycloak
< 18.0.0
redhat/openshift_container_platform
4.8
redhat/openshift_container_platform
4.9
redhat/single_sign-on
7.0
redhat/single_sign-on
7.5.0
Published
Aug 23, 2022
Tracked Since
Feb 18, 2026