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Components
C
Key Exchange Method
Name
Rivest–Shamir–Adleman (RSA)
Security
RSA[320][321] key exchange is a key exchange[467] that has no forward secrecy[135][136][137][138], and does not protect past sessions against future compromises. If long-term secret keys or passwords are compromised, encrypted communications and sessions recorded in the past can be retrieved and decrypted. Throughout its history RSA encryption has had many security flaws[310][311][312][313][314][315] and was affected by variety of attack types: chosen-ciphertext attack[557] (eg: Bleichenbacher's attack[76][77], ROBOT attack[540][541][542][543]), side-channel attack[106][107][108] (eg: padding oracle attack[45][46][47][48], like Bleichenbacher's cat[337][338][339][340]).
Recommendations
Always prefer cipher suites with PFS property over the non-PFS ones. Note that performance considerations implies preferring Ephemeral Elliptic-curve Diffie–Hellman[91][92] over Ephemeral Diffie-Hellman[142][143][144][145].
The symmetric key[193][194][195] withkey size[438] more than 128 bits as it is should be according to National Institute of Standards and Technology[428][429] so it is not vulnerable to preimage attack[215] and it cannreliably prove that message came from the stated sender (its authenticity) and has not been changed, so connection is not open for a man-in-the-middle attack[414].
Recommendations
Remove the cipher suite from the list of cipher suites supported by your server.
