Errata patches for OpenIKED have been released for OpenBSD 6.6 and 6.7. In iked, incorrect use of EVP_PKEY_cmp allows an authentication bypass.
Binary updates for the amd64, i386, and arm64 platforms are available via the syspatch utility. Source code patches can be found on the respective errata page: https://www.openbsd.org/errata66.html https://www.openbsd.org/errata67.html