A vulnerability exists in the BusyBox TLS server implementation in networking/tls.c. The get_client_hello() function reads p[0] (the compression-methods length byte) after consuming the cipher suite list without verifying that len > 0. A crafted ClientHello that ends immediately after the cipher suite list triggers a 1-byte out-of-bounds heap read.

This is a pre-authentication vulnerability. The one-byte OOB read can potentially leak a single byte of adjacent heap memory or cause a crash in memory-safety-hardened builds.