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Cloudflare One, Cloudflare WAN - IPsec downgrade protection (beta)

BetaUnverifiedAdded Sep 24, 2026

Cloudflare IPsec now supports the IKE_SA_INIT_FULL_TRANSCRIPT_AUTH ↗ IKEv2 extension to protect against downgrade attacks on IPsec tunnels. IKEv2's original authentication design has each endpoint sign only its own outbound messages, not the full handshake transcript.

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