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Components
C
Key Exchange Method
Name
RSA (Rivest-Shamir-Adleman)
Security
RSA[443][444] key exchange is a key exchange[133] that has no forward secrecy[127][128][129][130], 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[445][446][447][448][449][450] and was affected by variety of attack types: chosen-ciphertext attack[55] (eg: Bleichenbacher's attack[1][2], ROBOT attack[18][19][20][21]), side-channel attack[69][70][71] (eg: padding oracle attack[63][64][65][66], like Bleichenbacher's cat[3][4][5][6]).
Recommendations
Always prefer cipher suites with PFS property over the non-PFS ones. Note that performance considerations implies preferring Ephemeral Elliptic-curve Diffie–Hellman[432][433] over Ephemeral Diffie-Hellman[405][406][407][408].
Encryption algorithm Data Encryption Standard[333][334][335][336][337] is considered obsolete[338][339][340][341][342][343]. It is weakened against brute-force attack[54]. It cannot provide confidentiality[91][92][93], so connection is available or disclosed to unauthorized individuals, entities, or processes.
Recommendations
Remove the cipher suite from the list of cipher suites supported by your server.
Remove the cipher suite from the list of cipher suites supported by your server or at least set the cipher suite order explicitly and any cipher suite modes be preferred over ciphers suites with CBC modes.
D
Encryption Key Size
Name
56
Security
Any symmetric key[185][186][187] with key size[184] less than 128 bits are disallowed by National Institute of Standards and Technology[470][471] as it is vulnerable to preimage attack[67] in theory. It cannot reliably prove that message came from the stated sender (its authenticity) and has not been changed, so connection is open for a man-in-the-middle attack[61].
Recommendations
Remove the cipher suite from the list of cipher suites supported by your server.
Remove the cipher suite from the list of cipher suites supported by your server, or setup yout server to enforce changing session key regularly (rekeying[174]).