Race condition in the XMPP library in Smack before 4.1.9, when the SecurityMode.required TLS setting has been set, allows man-in-the-middle attackers to bypass TLS protections and trigger use of cleartext for client authentication by stripping the "starttls" feature from a server response.
{
"cwe_ids": [
"CWE-362"
],
"github_reviewed": true,
"github_reviewed_at": "2025-04-21T22:50:55Z",
"nvd_published_at": "2017-01-12T23:59:00Z",
"severity": "MODERATE"
}