Security advisory
In wolfSSL before 5.5.1, malicious clients can cause a buffer overflow during a TLS 1.3 handshake. This occurs when an attacker supposedly resumes a previous TLS session. During the resumption Client Hello a Hello Retry Request must be triggered. Both Client Hellos are required to contain a list of duplicate cipher suites to trigger the buffer overflow. In total, two Client Hellos have to be sent: one in the resumed session, and a second one as a response to a Hello Retry Request message.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2022-39173
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 16:47 UTC · Revision 1
Source evidence
In wolfSSL before 5.5.1, malicious clients can cause a buffer overflow during a TLS 1.3 handshake. This occurs when an attacker supposedly resumes a previous TLS session. During the resumption Client Hello a Hello Retry Request must be triggered. Both Client Hellos are required to contain a list of duplicate cipher suites to trigger the buffer overflow. In total, two Client Hellos have to be sent: one in the resumed session, and a second one as a response to a Hello Retry Request message.
osv:CVE-2022-39173
Complete source record
{
"id": "1108467aac1af7b12c8d54134a174b3ba59aa4ea16eac5a9698d993eeacc0667",
"url": "https://osv.dev/vulnerability/CVE-2022-39173",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2022-39173",
"summary": "In wolfSSL before 5.5.1, malicious clients can cause a buffer overflow during a TLS 1.3 handshake. This occurs when an attacker supposedly resumes a previous TLS session. During the resumption Client Hello a Hello Retry Request must be triggered. Both Client Hellos are required to contain a list of duplicate cipher suites to trigger the buffer overflow. In total, two Client Hellos have to be sent: one in the resumed session, and a second one as a response to a Hello Retry Request message.",
"evidence": "osv:CVE-2022-39173",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2022-39173",
"aliases": [
"CVE-2022-39173"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/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"
},
{
"fixed": "f1e2165c591f074feb47872a8ff712713ec411e1"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "5.5.1"
}
],
"source": "DESCRIPTION"
},
{
"cpe": "cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "5.5.1"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-39173.json"
}
}
],
"modified": "2026-10-28T02:30:30.485327803Z",
"provider": "osv",
"references": [
"https://www.wolfssl.com/docs/security-vulnerabilities/",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/39xxx/CVE-2022-39173.json",
"https://nvd.nist.gov/vuln/detail/CVE-2022-39173",
"https://github.com/wolfSSL/wolfssl/releases",
"https://blog.trailofbits.com/2023/01/12/wolfssl-vulnerabilities-tlspuffin-fuzzing-ssh/"
],
"provider_metadata": {
"cna_assigner": "mitre",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/39xxx/CVE-2022-39173.json"
}
},
"related_cves": [
{
"value": "CVE-2022-39173",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 497547,
"published_at": "2022-09-29T00:00:00+00:00"
}