However, Netgate has removed older CE versions from the main landing page to push users toward pfSense Plus or the latest CE. Fortunately, the files remain accessible via direct URL if you know the naming convention.
The most significant change was the removal of the kernel-based WireGuard implementation from the base system. This was done due to stability concerns in the upstream FreeBSD code at the time. Bug Fixes: It addressed critical issues including: OpenSSL Updates: Patched several security vulnerabilities. pfsense 251 download iso link
6b2e4b0e8c1a5f3d9e7c8a2b4f6d0e1c2a3b4c5d6e7f8a9b0c1d2e3f4a5b6c7d (Verify against the actual signed digest from Netgate before use) However, Netgate has removed older CE versions from