CVE-2021-3827

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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
6.8 MEDIUM
NETWORK
HIGH
LOW
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
redhatCNA
---
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CVEADP
---
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Base Score
CVSS 3.x
EPSS Score
Percentile: 26%
VendorProductVersion
redhatkeycloak
𝑥
< 18.0.0
redhatsingle_sign-on
7.0
redhatsingle_sign-on
7.5.0
redhatopenshift_container_platform
4.8
redhatopenshift_container_platform
4.9
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://access.redhat.com/security/cve/CVE-2021-3827
https://bugzilla.redhat.com/show_bug.cgi?id=2007512
https://github.com/keycloak/keycloak/commit/44000caaf5051d7f218d1ad79573bd3d175cad0d
https://github.com/keycloak/keycloak/security/advisories/GHSA-4pc7-vqv5-5r3v
https://access.redhat.com/security/cve/CVE-2021-3827
https://bugzilla.redhat.com/show_bug.cgi?id=2007512
https://github.com/keycloak/keycloak/commit/44000caaf5051d7f218d1ad79573bd3d175cad0d
https://github.com/keycloak/keycloak/security/advisories/GHSA-4pc7-vqv5-5r3v