An issue was discovered in wolfSSL that leads to ECDSA key disclosure via a safe-error attack using Rowhammer, known as FAULT+PROBE. When `WOLFSSL CHECK SIG FAULTS` is used in signing operations with private ECC keys, such as in server-side TLS connections, the connection is halted if any fault occurs. The success rate in a certain amount of connection requests can be processed via an advanced technique for ECDSA key recovery.