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Components
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Key Exchange Method
Name
Elliptic-curve Diffie–Hellman Ephemeral (ECDHE)
Security
Ephemeral Elliptic-curve Diffie–Hellman[91][92] is a variant of Elliptic-curve Diffie–Hellman[490][491] key exchange that has forward secrecy[135][136][137][138], and does protect past sessions against future compromises. If long-term secret keys or passwords are compromised, encrypted communications and sessions recorded in the past cannot be retrieved and decrypted.
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].
Encryption algorithm Rivest Cipher 4[459][460][461][462] is a stream cipher[78][79] that is more malleable[158] than a block cipher[524][525][526][527]. It has multiple vulnerabilities[27][28][29][30][31] (eg: related-key attack[53], distinguishing attack[349], ...), so attacker can apply statistical analysis against it to recover the encrypted text.
Recommendations
Remove the cipher suite from the list of cipher suites supported by your server.
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Encryption Key Size
Name
128
Security
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.
