wolfSSL is an open source TLS library used to add encrypted network communication to software. It is designed for small-footprint and resource-constrained environments, so it often appears in embedded devices, appliances, IoT products, and other systems where memory and CPU are limited.
In cyber security, wolfSSL matters because TLS code sits on a critical trust boundary: it handles certificate validation, key exchange, encryption, and session setup. A flaw in this layer can lead to handshake failures, denial of service, weak authentication, or, in some cases, exposure of sensitive data. Attackers often target these libraries indirectly by finding bugs in parsing, memory handling, or protocol logic. Defenders use wolfSSL to secure traffic, but they also need to track versions, patch quickly, and retest applications after updates, since a library change can affect connectivity and compatibility across many embedded products.