While investigating bug PROTON-2014, we discovered that under some circumstances Apache Qpid Proton versions 0.9 to 0.27.0 (C library and its language bindings) can connect to a peer anonymously using TLS *even when configured to verify the peer certificate* while used with OpenSSL versions before 1.1.0. This means that an undetected man in the middle attack could be constructed if an attacker can arrange to intercept TLS traffic.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| org.apache.qpid:proton-j(Maven) | 0.9 | 0.27.1 | N/A |
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