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GOST R 34.12-2015 "Magma"
Encryption algorithm GOST R 34.12-2015 (Magma)[353] is a block cipher[78][79][80][81] which is slight modification of GOST 28147-89[344][345] part of GOST[566][567][568][569] standard. Current version was designed by the Federal Technical Regulation and Metrology Agency[474][475] and now maintained by the Euro Asian Council for Standardization, Metrology and Certification[464]. The encryption algorithm is considered secure [354], however concept nothing up my sleeve numbers[154][155] is contradicted by hidden algorithms used in this encryption algorithm. Leading client applications do not use this algorithm. Unless your application or requirements specifically call for their use, it is generally safer to avoid cipher suites that are not adopted and supported by a critical mass of the industry.
Remove the cipher suite from the list of cipher suites supported by your server.
MGM
The block cipher mode of operation[82][83][84][85][86] multilinear galois mode[50] is considered secure[51][52]. It provides authenticated encryption[74] which simultaneously assure the confidentiality[91][92][93] and authenticity[75][76][77] of data.
If your application or requirements specifically call for the use of a message authentication code[135][136][137][138] that does not provide authenticated encryption[74] prefer block cipher mode of operation[82][83][84][85][86] (eg: counter with CBC-MAC[32][33][34], Galois/Counter Mode[46][47][48][49] or message authentication code[135][136][137][138] (eg: Poly1305[458][459]) that proved authenticated encryption over the ones which does not provide it.
256
The symmetric key[185][186][187] withkey size[184] more than 128 bits as it is should be according to National Institute of Standards and Technology[470][471] so it is not vulnerable to preimage attack[67] 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[61].
Remove the cipher suite from the list of cipher suites supported by your server.
64
Any block cipher[78][79][80][81] uses a block size[87] of 64 bits is vulnerable to sweet32 attack[22][23][24][25].
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]).
