CVE-2022-39173: wolfSSL

High severity, CVSS 7.5. EPSS: 5.8% chance of exploitation in the next 30 days.

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.

Affected products

• wolfSSL wolfSSL: before 5.5.1 (fixed in 5.5.1)

Published 2022-09-29. Last modified 2026-06-17.