ssh-audit -2 127.0.0.1
# general
(gen) banner: SSH-2.0-OpenSSH_8.7
(gen) software: OpenSSH 8.7
(gen) compatibility: OpenSSH 7.4+, Dropbear SSH 2018.76+
(gen) compression: enabled (zlib@openssh.com)
# security
(cve) CVE-2021-41617 -- (CVSSv2: 7.0) privilege escalation via supplemental groups
(cve) CVE-2016-20012 -- (CVSSv2: 5.3) enumerate usernames via challenge response
# key exchange algorithms
(kex) curve25519-sha256 -- [info] available since OpenSSH 7.4, Dropbear SSH 2018.76
`- [info] default key exchange since OpenSSH 6.4(kex) curve25519-sha256@libssh.org -- [info] available since OpenSSH 6.4, Dropbear SSH 2013.62`- [info] default key exchange since OpenSSH 6.4
(kex) diffie-hellman-group16-sha512 -- [info] available since OpenSSH 7.3, Dropbear SSH 2016.73
(kex) diffie-hellman-group18-sha512 -- [info] available since OpenSSH 7.3
(kex) diffie-hellman-group-exchange-sha256 (3072-bit) -- [info] available since OpenSSH 4.4
`- [info] OpenSSH's GEX fallback mechanism was triggered during testing. Very old SSH clients will still be able to create connections using a 2048-bit modulus, though modern clients will use 3072. This can only be disabled by recompiling the code (see https://github.com/openssh/openssh-portable/blob/V_9_4/dh.c#L477).# host-key algorithms(key) rsa-sha2-512 (4096-bit) -- [info] available since OpenSSH 7.2(key) rsa-sha2-256 (4096-bit) -- [info] available since OpenSSH 7.2(key) ssh-ed25519 -- [info] available since OpenSSH 6.5# encryption algorithms (ciphers)(enc) chacha20-poly1305@openssh.com -- [info] available since OpenSSH 6.5 `- [info] default cipher since OpenSSH 6.9(enc) aes256-gcm@openssh.com -- [info] available since OpenSSH 6.2(enc) aes128-gcm@openssh.com -- [info] available since OpenSSH 6.2(enc) aes256-ctr -- [info] available since OpenSSH 3.7, Dropbear SSH 0.52(enc) aes192-ctr -- [info] available since OpenSSH 3.7(enc) aes128-ctr -- [info] available since OpenSSH 3.7, Dropbear SSH 0.52# message authentication code algorithms(mac) hmac-sha2-256-etm@openssh.com -- [info] available since OpenSSH 6.2(mac) hmac-sha2-512-etm@openssh.com -- [info] available since OpenSSH 6.2(mac) umac-128-etm@openssh.com -- [info] available since OpenSSH 6.2# fingerprints(fin) ssh-ed25519: SHA256:y0irEICTkwOvIP47FGEIb+/MqQ1LYgVA+Jl8IeUxY4c(fin) ssh-rsa: SHA256:2GzmQeU6Gqqjz5yPsdv4L8HO76PlBQEhCUBvD5TWBmw# algorithm recommendations (for OpenSSH 8.7)(rec) +sntrup761x25519-sha512@openssh.com -- kex algorithm to append