Medium
Security advisory
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-44718
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 12:02 UTC · Revision 1
Source evidence
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.
osv:CVE-2021-44718
Complete source record
{
"id": "7fe270ece00c70b9a502e880aab75ecf8f0365b8c259a7f7affb1d510b00b87e",
"url": "https://osv.dev/vulnerability/CVE-2021-44718",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-44718",
"summary": "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.",
"evidence": "osv:CVE-2021-44718",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2021-44718",
"aliases": [
"CVE-2021-44718"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/wolfssl/wolfssl",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"last_affected": "7e01af012157bc20c840011a018619915380f05c"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"last_affected": "5.0.0"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"v5.0.0-stable",
"WCv5.0-RC9",
"v4.8.0-stable",
"v4.7.1r",
"v4.7.0-stable",
"v4.6.0-stable",
"v4.5.0-stable",
"v4.4.0-stable",
"v4.3.0-stable",
"v4.2.0c",
"v4.2.0-stable",
"v4.1.0-stable",
"v4.0.0-stable",
"list",
"v3.15.7-stable",
"v3.15.6",
"v3.15.5a",
"v3.15.5-stable",
"WCv4-rng-stable",
"v3.15.3-stable",
"l",
"v3.15.0-stable",
"v3.14.4",
"v3.14.2",
"v3.14.0b",
"v3.14.0a",
"v3.14.0-stable",
"v3.13.3",
"v3.13.2",
"v3.13.0-stable",
"v3.12.2-stable",
"v3.12.0-stable",
"v3.11.1-tls13-beta",
"v3.11.0-stable",
"v3.10.3",
"v3.10.2-stable",
"v3.10.0a",
"v3.10.0-stable",
"v3.9.10b",
"v3.9.10-stable",
"v3.9.8",
"v3.9.6w",
"v3.9.6",
"v3.9.1",
"v3.9.0",
"v3.8.0",
"v3.7.3",
"v3.7.1",
"v3.7.0",
"v3.6.9",
"v3.6.8",
"v3.4.6",
"v3.4.2",
"v3.4.0",
"v3.3.3",
"v3.3.0",
"v3.2.6",
"v3.2.4",
"v3.2.0",
"v2.9.4",
"v2.9.2",
"v2.9.1",
"v0.5",
"v2.9.0",
"v2.8.6",
"v2.8.5a",
"v2.8.5",
"v2.8.4",
"v2.8.3",
"v2.8.2",
"v2.8.0",
"v2.7.2",
"v2.7.0",
"v2.6.2",
"v2.6.0",
"v2.4.7",
"v2.4.6",
"v2.4.2",
"v2.0.8",
"v2.0.6",
"v2.0.3",
"v2.0.2",
"v2.0rc3",
"v2.0rc2b",
"v2.0rc2",
"v2.0rc1",
"v1.9.0",
"v1.8.8.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-44718.json"
}
}
],
"modified": "2026-10-20T10:55:06.868909671Z",
"provider": "osv",
"references": [
"https://github.com/wolfSSL/wolfssl/releases",
"https://www.wolfssl.com/docs/security-vulnerabilities/"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2021-44718",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 386912,
"published_at": "2022-09-02T12:15:09.337+00:00"
}