: As noted, this is the only protocol-level fix for the Terrapin vulnerability.

The most pressing security concern for anyone still running Bitvise SSH Server 8.48 is the Terrapin attack .

: This version disabled ineffective UPnP (Universal Plug and Play) actions for IPv6 addresses that previously generated errors.

: If your clients also use Bitvise, enabling SSH protocol obfuscation makes it harder for automated scanners to identify the service. Bitvise SSH Server Version History

While Bitvise 8.48 was a solid release for its time, it lacks modern cryptographic protections now standard in the 9.x series:

: It fixed a bug where 64-bit systems failed to detect instance name conflicts after installation.