etcd versions 3.2.x before 3.2.26 and 3.3.x before 3.3.11 are vulnerable to an improper authentication issue when role-based access control (RBAC) is used and client-cert-auth is enabled. If an etcd client server TLS certificate contains a Common Name (CN) which matches a valid RBAC username, a remote attacker may authenticate as that user with any valid (trusted) client certificate in a REST API request to the gRPC-gateway.
{
"cwe_ids": [
"CWE-285",
"CWE-287"
],
"github_reviewed": true,
"github_reviewed_at": "2021-05-19T21:49:34Z",
"severity": "HIGH",
"nvd_published_at": null
}