Yes, that's correct. The Heartbleed vulnerability (CVE-2014-0160) was a serious flaw found specifically in OpenSSL's implementation of the TLS Heartbeat Extension, allowing attackers to potentially access sensitive information such as private keys, passwords, and other protected data from affected servers.

However, users of wolfSSL and the former CyaSSL library were not impacted by this issue. Since the vulnerability was tied to OpenSSL's implementation, wolfSSL and CyaSSL remained secure and unaffected by the Heartbleed bug.