wolfSSL through 5.0.0 allows an attacker to cause a denial of service and infinite loop in the client component by sending crafted traffic from a Machine-in-the-Middle (MITM) position. The root cause is that the client module accepts TLS messages that normally are only sent to TLS servers.
{
"sources": [
{
"url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2021-44718",
"html_url": "https://nvd.nist.gov/vuln/detail/CVE-2021-44718",
"id": "CVE-2021-44718",
"imported": "2026-07-14T21:22:48.551Z",
"modified": "2026-06-17T04:12:45.727Z",
"published": "2022-09-02T12:15:09.337Z",
"database_specific": {
"status": "Modified"
}
}
],
"license": "CC-BY-4.0"
}