Logjam attack : PFS implementation fail

[n01xxv]

It seems to be an attacks similar to FREAK but against DH. Logjam successful attack can downgrade TLS connection to 512 bits.
Servers who accept DHE_export ciphers are affected.
Website :

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https://weakdh.org/Related paper :

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https://weakdh.org/imperfect-forward-secrecy.pdf