Problem ssl validation

Client SSL profile may be vulnerable to an Bleichenbacher attack against RSA, which when exploited, may result in plaintext recovery of encrypted messages and/or a Man-in-the-middle (MiTM) attack, despite the attacker not having gained access to the server's private key itself, aka a ROBOT attack. Inorder to correct you need to disable !RSA algorithm from cipher list.

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It will help you to increase the ssl rating. I would suggest to add below cipher in client ssl profile( try in non prod application)

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DEFAULT:ECDHE:!RSA:!DHE:!3DES

Hope it will help you.

Referenc link ​https://support.f5.com/csp/article/K21905460

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