strncat() without bounds
strncat(version, " ", sizeof(version)-1); strncat(version, tor_version, sizeof(version)-1);
Easily used incorrectly (e.g., incorrectly computing the correct maximum size to add) such as (CWE-120).
Consider strcat_s, strlcat, snprintf, or automatically resizing strings. I feel the risk is high because the length parameter appears to be a constant, instead of computing the number of characters left.
Request team to please have a look and validate.