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Are there any known situations, although infrequent or difficult to meet, where the Stellar Consensus protocol could not work well or where the network can be attacked by malicious nodes?

1

A partial answer is here, but I'd like to know more: https://rubin.io/public/pdfs/oort.pdf

Two open problems in Stellar are the mechanism by which quorums are chosen (peer selection) and how new arguments may be proposed such that contention is low (i.e. avoid dueling proposers).

and

Stellar consensus can be extremely inefficient in terms of number of messages sent, especially with dueling proposers.

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    Maybe that pdf is outdated? (Wrote on May 8, 2015) - On stellar site the SCP whitepaper is dated February 25, 2016 stellar.org/papers/stellar-consensus-protocol.pdf – Nekrataal Jan 19 '18 at 13:16
  • It shouldn't, as it is referring to the original whitepaper from Mazieres, the SCP creator. I don't know if the protocol has been modified afterwards. – Almaxia Jan 19 '18 at 13:25
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    @Almaxia Prof DM's SCP paper has been modified quite a few times, a Chinese translation version was released before Sep/4/2015. – Hongxu Chen Jan 19 '18 at 15:42

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