curl and libcurl before 7.50.2, when built with NSS and the libnsspem.so
library is available at runtime, allow remote attackers to hijack the
authentication of a TLS connection by leveraging reuse of a previously
loaded client certificate from file for a connection for which no
certificate has been set, a different vulnerability than CVE-2016-5420.

mdeslaur

tyhicks

only affects libcurl3-nss which is not widely used libcurl3 (OpenSSL based)