CVE-2016-8671 (matrixssl)
The pstm_exptmod function in MatrixSSL 3.8.6 and earlier does not properly perform modular expontiation, which might allow remote attackers to predict the secret key via unspecified vectors. NOTE: this vulnerability exists because of an incomplete fix for CVE-2016-6887.
Source: CVE-2016-8671 (matrixssl)